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 A177320 #13 May 16 2020 01:34:37 %S A177320 1,2,250,168284,175280570,226901044252,336181036999948, %T A177320 546641872918476120,951645881858020642746,1745708356607370063330620, %U A177320 3337797628633312532069739500,6600171805939224952685745226312,13419910030462066174528563412581260,27933944205209773363718168619462715544 %N A177320 Number of permutations of n copies of 1..8 with all adjacent differences <= 1 in absolute value. %H A177320 Andrew Howroyd, <a href="/A177320/b177320.txt">Table of n, a(n) for n = 0..100</a> %Y A177320 Row n=8 of A331562. %K A177320 nonn %O A177320 0,2 %A A177320 _R. H. Hardin_, May 06 2010 %E A177320 a(0)=1 prepended by _Alois P. Heinz_, Jan 20 2020 %E A177320 Terms a(7) and beyond from _Andrew Howroyd_, May 15 2020