Simple Imperfect Squared Rectangles were produced by computer in large quantities by Bouwkamp, Duijvestijn and Medema in the search for Perfect Squares Squares in the early 60's. Like SISS's, they often have interesting semi-symmetrical constructions. The sequence A002881 listed in the OEIS counts both imperfect squared rectangles and imperfect squared squares (a square is also rectangle). The bouwkampcodes below include nonsquare simple imperfect rectangles only, this is OEIS sequence A220165.

**Below are zipped tablecodes, bouwkampcodes and postscript. To the left are display menus and some pdfs. **. Right click on the bouwkampcode links and select 'save link as ...', to save the files (or similar for your browser)

Tablecodes | Bouwkampcodes | Postscript |

(1) SISRs Order 9 | (1) SISRs Order 9 | (1) SISRs Order 9 |

(9) SISRs Order 12 | (9) SISRs Order 12 | (9) SISRs Order 12 |

(33) SISRs Order 13 | (33) SISRs Order 13 | (33) SISRs Order 13 |

(104) SISRs Order 14 | (104) SISRs Order 14 | (104) SISRs Order 14 |

(280) SISRs Order 15 | (280) SISRs Order 15 | (280) SISRs Order 15 |

(948) SISRs Order 16 | (948) SISRs Order 16 | (948) SISRs Order 16 |

(3014) SISRs Order 17 | (3014) SISRs Order 17 | (3014) SISRs Order 17 |

(9494) SISRs Order 18 | (9494) SISRs Order 18 | (9494) SISRs Order 18 |

(30302) SISRs Order 19 | (30302) SISRs Order 19 | (30302) SISRs Order 19 |

(98897) SISRs Order 20 (3.3M) | (98897) SISRs Order 20 | (98897) SISRs Order 20 |

(323372) SISRs Order 21 (11.M zip) | (323372) SISRs Order 21 | (323372) SISRs Order 21 |

(1080168) SISRs Order 22 (40.5M zip) | (1080168) SISRs Order 22 | (1080168) SISRs Order 22 |

(3666666) SISRs Order 23 | (3666666) SISRs Order 23 | (3666666) SISRs Order 23 |

(12604812) SISRs Order 24 | (12604812) SISRs Order 24 | (12604812) SISRs Order 24 |