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 A133115 #11 Jun 10 2023 08:09:25 %S A133115 1,3,1,7,3,1,11,7,7,1,17,11,21,7,1,23,17,47,21,11,1,31,23,91,47,43,11, %T A133115 1,39,31,159,91,123,43,15,1,49,39,259,159,295,123,73,15,1,59,49,399, %U A133115 259,627,295,255,73,19,1,71,59,589,399,1219,627,733,255,111,19,1,83,71,839,589,2211,1219,1839,733,459,111,23,1 %N A133115 Triangle read by rows: 2*A133113 - A000012 as infinite lower triangular matrices. %C A133115 Left column = A047838: (1, 3, 7, 11, 17, 23, ...). %C A133115 Row sums = A000295: (1, 4, 11, 26, 57, ...). %e A133115 First few rows of the triangle: %e A133115 1; %e A133115 3, 1; %e A133115 7, 3, 1; %e A133115 11, 7, 7, 1; %e A133115 17, 11, 21, 7, 1; %e A133115 23, 17, 47, 21, 11, 1; %e A133115 31, 23, 91, 47, 43, 11, 1; %e A133115 ... %Y A133115 Cf. A000295, A047838, A133113. %K A133115 nonn,tabl %O A133115 1,2 %A A133115 _Gary W. Adamson_, Sep 14 2007 %E A133115 a(46) = 59 corrected and more terms from _Georg Fischer_, Jun 10 2023