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 A193975 #8 Jan 17 2014 10:12:48 %S A193975 2,3,8,4,11,20,5,14,26,40,6,17,32,50,70,7,20,38,60,85,112,8,23,44,70, %T A193975 100,133,168,9,26,50,80,115,154,196,240,10,29,56,90,130,175,224,276, %U A193975 330,11,32,62,100,145,196,252,312,375,440,12,35,68,110,160,217,280 %N A193975 Triangular array: the self-fission of (p(n,x)), where p(n,x)=x*p(n-1,x)+n+1, where p(0,x)=1. %C A193975 See A193842 for the definition of fission of two sequences of polynomials or triangular arrays. %e A193975 First six rows: %e A193975 2 %e A193975 3...8 %e A193975 4...11...20 %e A193975 5...14...26...40 %e A193975 6...17...32...50...70 %e A193975 7...20...38...60...85...112 %t A193975 z = 11; %t A193975 p[0, x_] := 1; p[n_, x_] := x*p[n - 1, x] + n + 1; %t A193975 q[n_, x_] := p[n, x]; %t A193975 p1[n_, k_] := Coefficient[p[n, x], x^k]; %t A193975 p1[n_, 0] := p[n, x] /. x -> 0; %t A193975 d[n_, x_] := Sum[p1[n, k]*q[n - 1 - k, x], {k, 0, n - 1}] %t A193975 h[n_] := CoefficientList[d[n, x], {x}] %t A193975 TableForm[Table[Reverse[h[n]], {n, 0, z}]] %t A193975 Flatten[Table[Reverse[h[n]], {n, -1, z}]] (* A193975 *) %t A193975 TableForm[Table[h[n], {n, 0, z}]] %t A193975 Flatten[Table[h[n], {n, -1, z}]] (* A193976 *) %Y A193975 Cf. A193842, A193976. %K A193975 nonn,tabl %O A193975 0,1 %A A193975 _Clark Kimberling_, Aug 10 2011