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 A240123 #13 Apr 05 2014 22:25:33 %S A240123 0,0,1,3,19,107,847,8647,119835,2255123,58125783,2050662011 %N A240123 Number of inequivalent ways to cut an n X n square into squares with integer sides, such that the dissection has a reflective symmetry in one diagonal, but no other symmetries. %C A240123 'Inequivalent' has the same sense as in A224239: we do not regard dissections that differ by a rotation and/or reflection as distinct. %H A240123 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 A240123 The three dissections for n=4: %e A240123 --------- --------- --------- %e A240123 | | | | | | | | | | %e A240123 | ----- | | | | --- %e A240123 | | | | | | | | | | %e A240123 --------- --------- | --- %e A240123 | | | | | | | | | | | | %e A240123 --------- | ----- --------- %e A240123 | | | | | | | | | | | | | | %e A240123 --------- --------- --------- %Y A240123 Cf. A226980, A045846, A224239, A240124, A240125. %K A240123 nonn,more %O A240123 1,4 %A A240123 _Ed Wynn_, Apr 01 2014