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 A193559 #5 Mar 30 2012 18:57:38 %S A193559 1,1,1,1,4,2,1,7,17,7,1,10,41,82,32,1,13,74,238,434,166,1,16,116,502, %T A193559 1412,2446,926,1,19,167,901,3317,8587,14405,5419,1,22,227,1462,6581, %U A193559 21802,53381,87610,32816,1,25,296,2212,11717,46681,143666,338038 %N A193559 Augmentation of the triangular array |A123191|. See Comments. %C A193559 For an introduction to the unary operation "augmentation" as applied to triangular arrays or sequences of polynomials, see A193091. %e A193559 First five rows of |A123191|: %e A193559 1 %e A193559 1...1 %e A193559 1...3...1 %e A193559 1...3...3...1 %e A193559 1...3...3...3...1 %e A193559 First 5 rows of A193559: %e A193559 1 %e A193559 1...1 %e A193559 1...4...2 %e A193559 1...7...17...7 %e A193559 1...10..41...82...32 %t A193559 p[n_, k_] := If[Or[k == 0, k == n], 1, 3] %t A193559 Table[p[n, k], {n, 0, 5}, {k, 0, n}] (* Abs. value of A123191 *) %t A193559 m[n_] := Table[If[i <= j, p[n + 1 - i, j - i], 0], {i, n}, {j, n + 1}] %t A193559 TableForm[m[4]] %t A193559 w[0, 0] = 1; w[1, 0] = p[1, 0]; w[1, 1] = p[1, 1]; %t A193559 v[0] = w[0, 0]; v[1] = {w[1, 0], w[1, 1]}; %t A193559 v[n_] := v[n - 1].m[n] %t A193559 TableForm[Table[v[n], {n, 0, 6}]] (* A193559 *) %t A193559 Flatten[Table[v[n], {n, 0, 10}]] %Y A193559 Cf. A193091. %K A193559 nonn,tabl %O A193559 0,5 %A A193559 _Clark Kimberling_, Jul 30 2011