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 A238919 #5 Mar 08 2014 03:32:34 %S A238919 0,0,0,0,0,0,0,0,0,232,1452,6494,25286,90304,307450,1014007,3287295, %T A238919 10616111,34460913,112044376,364112828,1180542604,3814897196, %U A238919 12278519104,39353932208,125637022720,399749617604,1268585240868,4017417046988,12700795616136 %N A238919 Number of self-inverse permutations p on [n] where the maximal displacement of an element equals 8. %H A238919 Joerg Arndt and Alois P. Heinz, <a href="/A238919/b238919.txt">Table of n, a(n) for n = 0..750</a> %e A238919 a(9) = 232: 923456781, 923456871, 923457681, 923458761, ..., 987456321, 987465321, 987546321, 987654321. %Y A238919 Column k=8 of A238889. %K A238919 nonn %O A238919 0,10 %A A238919 _Joerg Arndt_ and _Alois P. Heinz_, Mar 07 2014