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 A177301 #18 May 16 2020 01:33:39 %S A177301 1,1,252,7002,284002,8956752,276285002,8039989002,226901044252, %T A177301 6232521421502,167765555015002,4441865811412752,116042171156004002, %U A177301 2998175631045512002,76751828260736962252,1949598912568702682502,49197330547669842130002,1234523426440511782592752 %N A177301 Number of permutations of 5 copies of 1..n with all adjacent differences <= 1 in absolute value. %C A177301 a(n) = (5n)!/120^n = A014609(n) for n<=2. %H A177301 Andrew Howroyd, <a href="/A177301/b177301.txt">Table of n, a(n) for n = 0..200</a> %Y A177301 Cf. A014609. %Y A177301 Column k=5 of A331562. %K A177301 nonn %O A177301 0,3 %A A177301 _R. H. Hardin_, May 06 2010 %E A177301 a(10) from _Alois P. Heinz_, Jan 21 2020 %E A177301 Terms a(11) and beyond from _Andrew Howroyd_, May 15 2020