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 A087926 #4 Mar 31 2012 12:35:01 %S A087926 16,76544,2941306368,331333877743200,88366736882654697600, %T A087926 48653237600359922073441120,49992325433734834899948931370880 %N A087926 Number of ways of arranging the numbers 1 ... 5n into a 5 X n array so there is exactly one local maximum. %Y A087926 A row of the array in A087783. Cf. A007846. %K A087926 nonn %O A087926 1,1 %A A087926 _R. H. Hardin_, Oct 27 2003