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 A238918 #5 Mar 08 2014 03:32:31 %S A238918 0,0,0,0,0,0,0,0,76,438,1846,6664,22322,71223,221747,685899,2133273, %T A238918 6639848,20631028,63857132,196698620,602652416,1837237916,5577247428, %U A238918 16876196404,50936285192,153419520771,461274617487,1384650408582,4150200289940,12421725164955 %N A238918 Number of self-inverse permutations p on [n] where the maximal displacement of an element equals 7. %H A238918 Joerg Arndt and Alois P. Heinz, <a href="/A238918/b238918.txt">Table of n, a(n) for n = 0..750</a> %e A238918 a(8) = 76: 82345671, 82345761, 82346571, 82347651, ..., 87543621, 87563421, 87645321, 87654321. %Y A238918 Column k=7 of A238889. %K A238918 nonn %O A238918 0,9 %A A238918 _Joerg Arndt_ and _Alois P. Heinz_, Mar 07 2014