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 A350753 #4 Jan 14 2022 19:46:24 %S A350753 1,0,0,0,1,0,0,0,1,0,0,0,2,1,0,0,0,1,4,1,0,0,0,1,16,7,1,0,0,0,0,22,58, %T A350753 10,1,0,0,0,0,22,240,165,14,1,0,0,0,0,11,565,1281,365,18,1,0,0,0,0,5, %U A350753 928,6063,4838,733,23,1,0,0,0,0,1,1065,19591,38516,14661,1317,28,1,0 %N A350753 Triangle read by rows: T(n,k) is the number of unlabeled strongly connected digraphs with n arcs and k vertices, n >= 0, k = 1..n+1. %e A350753 Triangle begins: %e A350753 1; %e A350753 0, 0; %e A350753 0, 1, 0; %e A350753 0, 0, 1, 0; %e A350753 0, 0, 2, 1, 0; %e A350753 0, 0, 1, 4, 1, 0; %e A350753 0, 0, 1, 16, 7, 1, 0; %e A350753 0, 0, 0, 22, 58, 10, 1, 0; %e A350753 0, 0, 0, 22, 240, 165, 14, 1, 0; %e A350753 0, 0, 0, 11, 565, 1281, 365, 18, 1, 0; %o A350753 (PARI) \\ See PARI link in A350489 for program code. %o A350753 my(A=A350753rows(10)); for(n=1, #A, print(A[n])) %Y A350753 Row sums are A350752. %Y A350753 Column sums are A035512. %Y A350753 Cf. A057276 (transpose), A350450, A350489. %K A350753 nonn,tabl %O A350753 0,13 %A A350753 _Andrew Howroyd_, Jan 14 2022