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 A225967 #9 Aug 05 2015 16:57:55 %S A225967 1,21,273,2874,27243,246037,2192863,19766016,183564396,1782944112, %T A225967 18338911012,201770228316,2392011321782,30683876823738, %U A225967 426312246308898,6403885291569540,103619141358704966,1797448899803758010,33259985875540203746,653383741590779444772 %N A225967 Number of permutations of [n] having exactly 6 strong fixed blocks. %C A225967 See A186373 for the definition of strong fixed blocks. %H A225967 Alois P. Heinz, <a href="/A225967/b225967.txt">Table of n, a(n) for n = 16..460</a> %F A225967 a(n) ~ 5 * n! / n^14. - _Vaclav Kotesovec_, Aug 29 2014 %Y A225967 Column k=6 of A186373. %K A225967 nonn %O A225967 16,2 %A A225967 _Alois P. Heinz_, May 22 2013