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 A171505 #10 Sep 08 2013 19:59:25 %S A171505 1,3,1,10,6,1,34,29,9,1,117,128,57,12,1,405,538,309,94,15,1,1407,2192, %T A171505 1533,604,140,18,1,4899,8740,7179,3453,1040,195,21,1,17083,34296, %U A171505 32278,18264,6730,1644,259,24,1,59629,132929,140790,91372,39668,11877,2443 %N A171505 Riordan array (f(x), x*f(x)) where f(x) is the g.f. of A059738. %C A171505 Equal to B*A096164 = A171488*B, B=A007318. %F A171505 Sum_{k, 0<=k<=n} T(n,k)*x^k = A005043(n), A001006(n), A005773(n+1), A059738(n) for x = -3, -2, -1, 0 respectively. %F A171505 T(n,k) = T(n-1,k-1) + 3*T(n-1,k) + sum_{i, i>=0} T(n-1,k+1+i)*(-2)^i. - _Philippe Deléham_, Feb 23 2012 %e A171505 Triangle begins : %e A171505 1 ; %e A171505 3, 1 ; %e A171505 10, 6, 1 ; %e A171505 34, 29, 9, 1 ; %e A171505 117, 128, 57, 12, 1 ; ... %Y A171505 Cf. A097609, A064189, A171488, A096164 %K A171505 nonn,tabl %O A171505 0,2 %A A171505 _Philippe Deléham_, Dec 10 2009