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 A177310 #13 May 16 2020 01:34:10 %S A177310 1,1,12870,6077196,5650739930,3772321496064,2514046004253110, %T A177310 1570273521448103668,951645881858020642746,560523113474283819256640, %U A177310 323221203836407773725200718,183122229346363470922528553652,102256611847518844993947706000234 %N A177310 Number of permutations of 8 copies of 1..n with all adjacent differences <= 1 in absolute value. %C A177310 a(n) = (8n)!/40320^n = A172609(n) for n<=2. %H A177310 Andrew Howroyd, <a href="/A177310/b177310.txt">Table of n, a(n) for n = 0..200</a> %Y A177310 Column k=8 of A331562. %Y A177310 Cf. A172609. %K A177310 nonn %O A177310 0,3 %A A177310 _R. H. Hardin_, May 06 2010 %E A177310 a(0)=1 prepended by _Alois P. Heinz_, Jan 21 2020 %E A177310 Terms a(7) and beyond from _Andrew Howroyd_, May 15 2020