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 A099092 #11 Jan 25 2020 01:39:56
%S A099092 1,0,2,0,4,4,0,0,16,8,0,0,16,48,16,0,0,0,96,128,32,0,0,0,64,384,320,
%T A099092 64,0,0,0,0,512,1280,768,128,0,0,0,0,256,2560,3840,1792,256,0,0,0,0,0,
%U A099092 2560,10240,10752,4096,512,0,0,0,0,0,1024,15360,35840,28672,9216,1024,0,0,0
%N A099092 Riordan array (1,2+4x).
%C A099092 Row sums are A063727. Diagonal sums are A052907.
%C A099092 The Riordan array (1, s+tx) defines T(n,k) = binomial(k,n-k)*s^k*(t/s)^(n-k). The row sums satisfy a(n) = s*a(n-1) + t*a(n-2) and the diagonal sums satisfy a(n) = s*a(n-2) + t*a(n-3).
%F A099092 Number triangle T(n,k) = binomial(k, n-k)*2^n; columns have g.f. (2x+4x^2)^k.
%F A099092 T(n,k) = A113953(n,k)*2^k = A026729(n,k)*2^n. - _Philippe Deléham_, Dec 11 2008
%e A099092 Rows begin
%e A099092 {1},
%e A099092 {0, 2},
%e A099092 {0, 4, 4},
%e A099092 {0, 0, 16, 8},
%e A099092 {0, 0, 16, 48, 16}, ...
%Y A099092 Cf. A026729, A038210, A052907, A063727, A113953.
%K A099092 easy,nonn,tabl
%O A099092 0,3
%A A099092 _Paul Barry_, Sep 25 2004