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 A177303 #6 Jan 19 2016 18:22:54 %S A177303 1,1,252,756756,11732745024,52977847995072,131319696504676680, %T A177303 302061042944500510428,847432462636241316703042 %N A177303 Number of permutations of 5 copies of 1..n with all adjacent differences <= 3 in absolute value. %C A177303 a(n) = (5n)!/120^n for n<=4. %Y A177303 Cf. A014609. %K A177303 nonn %O A177303 0,3 %A A177303 _R. H. Hardin_, May 06 2010 %E A177303 a(0), a(8) from _Alois P. Heinz_, Jan 19 2016