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 A323803 #6 Jan 28 2019 12:21:09
%S A323803 0,9360,115080,966456,6791994,43414690,264609407,1583571277,
%T A323803 9541763303,58695274369,364677611732,2271214783228,14108312731920,
%U A323803 87159560106240,534932437294080,3263015911353024,19810718453429904,119955619407015668,725303963303861844
%N A323803 Number of permutations p of [n] such that max_{j=1..n} |p(j)-j| = 7.
%H A323803 Alois P. Heinz, <a href="/A323803/b323803.txt">Table of n, a(n) for n = 7..1000</a>
%F A323803 a(n) = A154656(n) - A154655(n).
%Y A323803 Column k=7 of A130152.
%Y A323803 Cf. A154655, A154656.
%K A323803 nonn,easy
%O A323803 7,2
%A A323803 _Alois P. Heinz_, Jan 28 2019