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 A136573 #9 Jun 05 2023 05:22:58 %S A136573 1,1,1,2,2,3,6,6,7,11,24,24,25,29,47,120,120,121,125,143,239,720,720, %T A136573 721,725,743,839,1439,5040,5040,5041,5045,5063,5159,5759,10079,40320, %U A136573 40320,40321,40325,40343,40439,41039,45359,80639,362880,362880,362881,362885,362903,362999,363599,367919,403199,725759 %N A136573 Triangle read by rows: (A000012 * A136572 + A136572 * A000012) - A000012. %C A136573 Row sums = A136574. %C A136573 Right border = 2*n! - 1 = A020543: (1, 1, 3, 11, 47, 239, 1439, ...). %F A136573 (A000012 * A136572 + A136572 * A000012) - A000012, as infinite lower triangular matrices. %F A136573 Triangle read by rows: n-th row = (n+1) terms of n! + (k! - 1), k = 0, 1, 2, ...; where the sequence (k! - 1) = A033312: (0, 0, 1, 5, 23, 119, 719, 5039, ...). %e A136573 First few rows of the triangle: %e A136573 1; %e A136573 1, 1; %e A136573 2, 2, 3; %e A136573 6, 6, 7, 11; %e A136573 24, 24, 25, 49, 47; %e A136573 120, 120, 121, 125, 143, 239; %e A136573 720, 720, 721, 725, 743, 839, 1439; %e A136573 5040, 5040, 5041, 5045, 5063, 5159, 5759, 10079; ... %e A136573 Row 4 = (24, 24, 25, 29, 47) = 5 terms of (24, 24, 24, 24, 24) + (0, 0, 1, 5, 23), where A033312 = (0, 0, 1, 5, 23, 119, 719, 5039, ...). %Y A136573 Cf. A020543, A033312, A136572, A136574. %K A136573 nonn,tabl %O A136573 0,4 %A A136573 _Gary W. Adamson_, Jan 07 2008 %E A136573 a(41) corrected and more terms from _Georg Fischer_, Jun 05 2023