This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A240122 #13 Jul 23 2025 11:01:12 %S A240122 0,0,0,0,1,2,12,40,154,760,3260,22730 %N A240122 Number of inequivalent ways to cut an n X n square into squares with integer sides, such that the dissection has 90-degree rotational symmetry and no reflective symmetry. %H A240122 Ed Wynn, <a href="http://arxiv.org/abs/1308.5420">Exhaustive generation of Mrs Perkins's quilt square dissections for low orders</a>, arXiv:1308.5420 %e A240122 The two dissections for n=6: %e A240122 ------------- ------------- %e A240122 | | | | | | | | | | | | %e A240122 --- ------- --- ------- %e A240122 | | | | | | | | | | %e A240122 --------- | --------- | %e A240122 | | | | | | | | | | | %e A240122 ----- ----- ------------- %e A240122 | | | | | | | | | | | %e A240122 | --------- --------- %e A240122 | | | | | | | | | | %e A240122 ------- --- ------- --- %e A240122 | | | | | | | | | | | | %e A240122 ------------- ------------- %Y A240122 Cf. A226979, A045846, A224239, A240120, A240121. %K A240122 nonn,more %O A240122 1,6 %A A240122 _Ed Wynn_, Apr 01 2014