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 A177304 #15 May 16 2020 01:33:49 %S A177304 1,1,924,65226,7426610,640160976,54331653686,4339892975512, %T A177304 336181036999948,25328979140590460,1869147741803280158, %U A177304 135594223551932310368,9700134237572864570026,685890678156217774839644,48025674779522388568648420,3334799454210630503054336064 %N A177304 Number of permutations of 6 copies of 1..n with all adjacent differences <= 1 in absolute value. %C A177304 a(n) = (6n)!/720^n = A248814(n) for n<=2. %H A177304 Andrew Howroyd, <a href="/A177304/b177304.txt">Table of n, a(n) for n = 0..200</a> %Y A177304 Column k=6 of A331562. %Y A177304 Cf. A248814. %K A177304 nonn %O A177304 0,3 %A A177304 _R. H. Hardin_, May 06 2010 %E A177304 a(0)=1 prepended by _Alois P. Heinz_, Jan 21 2020 %E A177304 a(9) from _Alois P. Heinz_, Jan 23 2020 %E A177304 Terms a(10) and beyond from _Andrew Howroyd_, May 15 2020