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 A177307 #13 May 16 2020 01:33:56 %S A177307 1,1,3432,623576,201922730,48203722464,11408205434138, %T A177307 2535604038015218,546641872918476120,114573118435555703030, %U A177307 23513682407867601161354,4742254932865402388419776,942857462878069039167940082,185226548794692635344238756018,36021105095432337381819132791160 %N A177307 Number of permutations of 7 copies of 1..n with all adjacent differences <= 1 in absolute value. %C A177307 a(n) = (7n)!/5040^n = A172603(n) for n<=2. %H A177307 Andrew Howroyd, <a href="/A177307/b177307.txt">Table of n, a(n) for n = 0..200</a> %Y A177307 Column k=7 of A331562. %Y A177307 Cf. A172603. %K A177307 nonn %O A177307 0,3 %A A177307 _R. H. Hardin_, May 06 2010 %E A177307 a(0)=1 prepended by _Alois P. Heinz_, Jan 21 2020 %E A177307 Terms a(8) and beyond from _Andrew Howroyd_, May 15 2020