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 A217327 #7 Oct 14 2012 17:58:33 %S A217327 1,7,55,319,1904,10275,56135,294386,1556323,8086433,42298721, %T A217327 219795160,1149139210,5999688692,31506046052,165664633982, %U A217327 875886376212,4643488263933,24746018418741,132328997879066,711142850556217,3836134976520394,20791024498584110 %N A217327 Number of self-inverse permutations in S_n with longest increasing subsequence of length 7. %C A217327 Also the number of Young tableaux with n cells and 7 rows. %H A217327 Alois P. Heinz, <a href="/A217327/b217327.txt">Table of n, a(n) for n = 7..400</a> %F A217327 a(n) = A182172(n,7)-A182172(n,6) = A007578(n)-A007579(n). %e A217327 a(7) = 1: 1234567. %e A217327 a(8) = 7: 12345687, 12345768, 12346578, 12354678, 12435678, 13245678, 21345678. %Y A217327 Column k=7 of A047884. %Y A217327 Cf. A007578, A007579, A182172. %K A217327 nonn %O A217327 7,2 %A A217327 _Alois P. Heinz_, Sep 30 2012