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 A177328 #14 Jun 07 2025 15:56:11 %S A177328 1,428,6068622,171548183912,6595449547140990,302061042944500510428, %T A177328 15490059482899736687180550,859754565449162833823191994960, %U A177328 50593398455336474751923402897514750,3114239698138241536925385754973336892980,198659268102792043540362525905723850226165122 %N A177328 Number of permutations of n copies of 1..7 with all adjacent differences <= 3 in absolute value. %H A177328 Martin Fuller, <a href="/A177328/b177328.txt">Table of n, a(n) for n = 0..11</a> %K A177328 nonn %O A177328 0,2 %A A177328 _R. H. Hardin_, May 06 2010 %E A177328 a(0) and a(6) from _Alois P. Heinz_, Jan 20 2020 %E A177328 a(7) onwards from _Martin Fuller_, Jun 07 2025