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 A153345 #9 Jun 02 2025 01:16:46 %S A153345 1,2,0,4,1,0,7,4,1,0,12,11,5,1,0,20,26,17,6,1,0,33,56,48,24,7,1,0,54, %T A153345 114,121,78,32,8,1,0,88,223,283,223,117,41,9,1,0,143,424,627,584,372, %U A153345 166,51,10,1,0,232,789,1334,1434,1073,579,226,62,11,1,0,376,1444,2750,3352,2879,1818,856,298,74,12,1,0 %N A153345 Triangle read by rows, A000012 * A055830. %C A153345 Row sums = Pell numbers, A000129: (1, 2, 5, 12, 29,...). %C A153345 Left border = A000071. %F A153345 Triangle read by rows, A000012 * triangle A055830 = partial sums of A055830 columns. %e A153345 First few rows of the triangle = %e A153345 1; %e A153345 2, 0; %e A153345 4, 1, 0; %e A153345 7, 4, 1, 0; %e A153345 12, 11, 5, 1, 0; %e A153345 20, 26, 17, 6, 1, 0; %e A153345 33, 56, 48, 24, 7, 1, 0; %e A153345 54, 114, 121, 78, 32, 8, 1, 0; %e A153345 88, 223, 283, 223, 117, 41, 9, 1, 0; %e A153345 143, 424, 627, 584, 372, 166, 51, 10, 1, 0; %e A153345 232, 789, 1334, 1434, 1073, 579, 226, 62, 11, 1, 0; %e A153345 ... %Y A153345 Cf. A000129, A055830. %K A153345 nonn,tabl %O A153345 1,2 %A A153345 _Gary W. Adamson_, Dec 24 2008 %E A153345 a(21) = 0 inserted and more terms from _Georg Fischer_, May 29 2023