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 A153864 #5 Jun 02 2025 01:17:43 %S A153864 1,1,1,2,2,1,1,2,2,3,2,2,2,6,3,1,2,2,6,6,7,2,2,2,6,6,14,9,1,2,2,6,6, %T A153864 14,18,17,2,2,2,6,6,14,18,34,25,1,2,2,6,6,14,18,34,50,43,2,2,2,6,6,14, %U A153864 18,34,50,86,67 %N A153864 Triangle read by rows, A000012 * A153860 * (A066983 * 0^(n-k)). %C A153864 Row sums = A066629: (1, 2, 5, 8, 15, 24, 41, 66, 109,...). %C A153864 Right border = A066983: (1, 1, 1, 3, 3, 7, 9, 17,...). %F A153864 Triangle read by rows, A000012 * A153860 * (A066983 * 0^(n-k)) %F A153864 Given triangle A000012 * A153860 = partial sums of A153860 starting from the top. %F A153864 (A066983 * 0^n-k) = an infinite lower triangular matrix with A066983 as the %F A153864 main diagonal: (1, 1, 1, 3, 3, 7, 9, 17, 25,...) and the rest zeros. %e A153864 First few rows of the triangle = %e A153864 1; %e A153864 1, 1; %e A153864 2, 2, 1; %e A153864 1, 2, 2, 3; %e A153864 2, 2, 2, 6, 3; %e A153864 1, 2, 2, 6, 6, 7; %e A153864 2, 2, 2, 6, 6, 14, 9; %e A153864 1, 2, 2, 6, 6, 14, 18, 17; %e A153864 2, 2, 2, 6, 6, 14, 18, 34, 25; %e A153864 1, 2, 2, 6, 6, 14, 18, 34, 50, 43; %e A153864 ... %Y A153864 Cf. A153860, A066983, A066629 %K A153864 nonn,tabl %O A153864 0,4 %A A153864 _Gary W. Adamson_, Jan 03 2009