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 A225966 #9 Aug 05 2015 16:56:14 %S A225966 1,17,187,1725,14770,123810,1049683,9201893,84765839,830632443, %T A225966 8737884632,99283914256,1222304625766,16308650537598,235329993989098, %U A225966 3658770788460622,61010416134839892,1085940325012439060,20537758641146194266,410995800089222969774 %N A225966 Number of permutations of [n] having exactly 5 strong fixed blocks. %C A225966 See A186373 for the definition of strong fixed blocks. %H A225966 Alois P. Heinz, <a href="/A225966/b225966.txt">Table of n, a(n) for n = 13..450</a> %F A225966 a(n) ~ 4 * n! / n^11. - _Vaclav Kotesovec_, Aug 29 2014 %Y A225966 Column k=5 of A186373. %K A225966 nonn %O A225966 13,2 %A A225966 _Alois P. Heinz_, May 22 2013