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 A217326 #7 Oct 14 2012 18:03:43 %S A217326 1,6,41,209,1106,5323,26069,122901,585922,2747977,13000269,61088173, %T A217326 289186846,1366147708,6496681304,30905464864,147912712795, %U A217326 709073550307,3418258506885,16517431269189,80230551304034,390774361811783,1912602871119956,9388456361080840 %N A217326 Number of self-inverse permutations in S_n with longest increasing subsequence of length 6. %C A217326 Also the number of Young tableaux with n cells and 6 rows. %H A217326 Alois P. Heinz, <a href="/A217326/b217326.txt">Table of n, a(n) for n = 6..400</a> %F A217326 a(n) = A182172(n,6)-A182172(n,5) = A007579(n)-A049401(n). %e A217326 a(6) = 1: 123456. %e A217326 a(7) = 6: 1234576, 1234657, 1235467, 1243567, 1324567, 2134567. %Y A217326 Column k=6 of A047884. %Y A217326 Cf. A007579, A049401, A182172. %K A217326 nonn %O A217326 6,2 %A A217326 _Alois P. Heinz_, Sep 30 2012