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 A171670 #3 Sep 08 2013 13:31:52
%S A171670 1,1,1,2,2,1,5,6,3,1,13,20,12,4,1,35,65,50,20,5,1,96,210,195,100,30,6,
%T A171670 1,267,672,735,455,175,42,7,1,750,2136,2688,1960,910,280,56,8,1,2123,
%U A171670 6750,9612,8064,4410,1638,420,72,9,1
%N A171670 Triangle T read by rows : T(n,k)= A007318(n,k)*A005773(n-k).
%F A171670 Sum_{k, 0<=k<=n} T(n,k)= A024718(n).
%e A171670 Triangle begins : 1 ; 1,1 ; 2,2,1 ; 5,6,3,1 ; 13,20,12,4,1 ; 35,65,50,20,5,1 ; ...
%Y A171670 Cf. A171651
%K A171670 nonn,tabl
%O A171670 0,4
%A A171670 _Philippe Deléham_, Dec 14 2009