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 A101820 #6 Jul 11 2018 20:12:23 %S A101820 1,1,3,1,14,12,1,45,150,60,1,124,1080,1560,360,1,315,6020,21000,16800, %T A101820 2520,1,762,28980,204120,378000,191520,20160,1,1785,127050,1631700, %U A101820 5838840,6667920,2328480,181440,1,4088,522480,11459280,71442000 %N A101820 Triangle read by rows: T(n,h)/(n-1), where T is the array in A101819. %H A101820 Paul Barry, <a href="https://arxiv.org/abs/1804.05027">The Gamma-Vectors of Pascal-like Triangles Defined by Riordan Arrays</a>, arXiv:1804.05027 [math.CO], 2018. %F A101820 T(n, h) = C(n-1, h)*U(n, h)/(n-1), where U(n, h) is the array in A019538. %e A101820 First rows: %e A101820 1 %e A101820 1 3 %e A101820 1 14 12 %e A101820 4 45 150 60 %Y A101820 Cf. A019538, A101817, A101819, A101821. %K A101820 nonn,tabl %O A101820 0,3 %A A101820 _Clark Kimberling_, Dec 17 2004