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 A087930 #4 Mar 31 2012 12:35:01 %S A087930 256,72545402880,1811764909105311267840, %T A087930 299167849199075018703047460201600 %N A087930 Number of ways of arranging the numbers 1 ... 9n into a 9 X n array so there is exactly one local maximum. %Y A087930 A row of the array in A087783. Cf. A007846. %K A087930 nonn %O A087930 1,1 %A A087930 _R. H. Hardin_, Oct 27 2003