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 A130847 #4 Sep 08 2013 13:31:20
%S A130847 1,1,1,3,5,2,15,42,37,10,105,450,699,458,104,945,5775,13845,16065,
%T A130847 8866,1816,10395,85995,293265,522345,506028,248660,47312
%N A130847 Triangle T(n,k), 0<=k<=n, read by rows, given by [1,2,3,4,5,6,7,8,9,10,...] DELTA [1,1,6,6,15,15,28,28,...] where DELTA is the operator defined in A084938 .
%F A130847 Sum_{k, 0<=k<=n}T(n,k)*x^k = A033999(n), A000007(n), A001147(n), A005799(n+1), A125054(n), A126152(n), A126157(n) for x= -2, -1, 0, 1, 2, 3, 4 respectively . T(n,n)=A005799(n).
%e A130847 Triangle begins:
%e A130847 1;
%e A130847 1, 1;
%e A130847 3, 5, 2;
%e A130847 15, 42, 37, 10;
%e A130847 105, 450, 699, 458, 104;
%e A130847 945, 5775, 13845, 16065, 8866, 1816;
%e A130847 10395, 85995, 293265, 522345, 506028, 248660, 47312 ;...
%K A130847 nonn,tabl
%O A130847 0,4
%A A130847 _Philippe Deléham_, Jul 21 2007, Jul 25 2007