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 A171839 #3 Sep 08 2013 13:31:52
%S A171839 1,0,0,1,0,0,1,1,0,0,3,2,1,0,0,6,8,3,1,0,0,15,22,15,4,1,0,0,36,68,52,
%T A171839 24,5,1,0,0,91,198,191,100,35,6,1,0,0,232,586,651,425,170,48,7,1,0,0,
%U A171839 603,1718,2203,1656,820,266,63,8,1,0,0,1585,5047,7285,6299,3591,1435,392,80
%N A171839 Equal to A171368*A007318.
%C A171839 Another version of A114586.
%F A171839 Sum_{k, 0<=k<=n} T(n,k)*x^k = A099323(n+1), A126120(n), A005043(n), A000957(n+1), A117641(n) for x = -2, -1, 0, 1, 2 respectively.
%e A171839 Triangle begins : 1 ; 0,0 ; 1,0,0 ; 1,1,0,0 ; 3,2,1,0,0 ; 6,8,3,1,0,0 ; ...
%K A171839 nonn,tabl
%O A171839 0,11
%A A171839 _Philippe Deléham_, Dec 19 2009