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 A239080 #6 Mar 10 2014 13:16:30 %S A239080 1,1,2,4,10,26,76,232,764,2620,8732,28068,88448,273590,839026,2559590, %T A239080 7810344,23899859,73552737,227149812,702978992,2177474284,6745619532, %U A239080 20888771872,64643999584,199916632224,617935452464,1909553806592,5900616453456,18234154867712 %N A239080 Number of self-inverse permutations p on [n] with displacement of elements restricted by 8: |p(i)-i| <= 8. %H A239080 Joerg Arndt and Alois P. Heinz, <a href="/A239080/b239080.txt">Table of n, a(n) for n = 0..1000</a> %Y A239080 Column k=8 of A238888. %Y A239080 Cf. A000085. %K A239080 nonn %O A239080 0,3 %A A239080 _Joerg Arndt_ and _Alois P. Heinz_, Mar 10 2014