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 A177326 #18 Jun 08 2025 13:42:40 %S A177326 1,72,41580,37850400,42251309100,52977847995072,71614356453896256, %T A177326 102038786510159790720,151158246783053570131500, %U A177326 230729955958244519983206000,360656999876515853295073369080,574739352751818771710077504838400,930674941577730459521320183457601600 %N A177326 Number of permutations of n copies of 1..5 with all adjacent differences <= 3 in absolute value. %H A177326 Martin Fuller, <a href="/A177326/b177326.txt">Table of n, a(n) for n = 0..85</a> (terms up to n=14 from R. H. Hardin) %F A177326 a(n) = A103881(3n,n) * A006480(n). - _Martin Fuller_, Jun 08 2025 %Y A177326 Cf. A177316 - A177328. A103881. %K A177326 nonn %O A177326 0,2 %A A177326 _R. H. Hardin_, May 06 2010 %E A177326 a(0)=1 prepended by _Martin Fuller_, Jun 08 2025