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 A225965 #9 Aug 05 2015 16:54:58 %S A225965 1,13,117,928,7125,55527,451472,3896347,36098855,361638248,3932908263, %T A225965 46483325765,596325240445,8278698772954,123863754811374, %U A225965 1988038987565688,34070987657660446,620747700139873322,11975106447284305656,243741719070454243530 %N A225965 Number of permutations of [n] having exactly 4 strong fixed blocks. %C A225965 See A186373 for the definition of strong fixed blocks. %H A225965 Alois P. Heinz, <a href="/A225965/b225965.txt">Table of n, a(n) for n = 10..450</a> %F A225965 a(n) ~ 3 * n! / n^8. - _Vaclav Kotesovec_, Aug 29 2014 %Y A225965 Column k=4 of A186373. %K A225965 nonn %O A225965 10,2 %A A225965 _Alois P. Heinz_, May 22 2013