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 A134520 #10 Jun 07 2023 08:51:15 %S A134520 1,0,1,1,1,1,0,3,2,1,1,3,6,3,1,0,5,9,10,4,1,1,5,15,19,15,5,1,0,7,20, %T A134520 35,34,21,6,1,1,7,28,55,70,55,28,7,1,0,9,35,84,125,126,83,36,8,1,1,9, %U A134520 45,119,210,251,210,119,45,9,1,0,11,54,165,329,462,461,330,164,55,10,1 %N A134520 Triangle read by rows: A007318 + A128174 - A000012 as infinite lower triangular matrices. %C A134520 Row sums = A084174: (1, 1, 3, 6, 14, 29, 61, ...). %e A134520 First few rows of the triangle: %e A134520 1; %e A134520 0, 1; %e A134520 1, 1, 1; %e A134520 0, 3, 2, 1; %e A134520 1, 3, 6, 3, 1; %e A134520 0, 5, 9, 10, 4, 1; %e A134520 1, 5, 15, 19, 15, 5, 1; %e A134520 0, 7, 20, 35, 34, 21, 6, 1; %e A134520 1, 7, 28, 55, 70, 55, 28, 7, 1; %e A134520 ... %Y A134520 Cf. A084174, A128174. %K A134520 nonn,tabl %O A134520 0,8 %A A134520 _Gary W. Adamson_, Oct 29 2007 %E A134520 a(45) = 1 corrected and more terms from _Georg Fischer_, Jun 07 2023