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 A320080 #20 Sep 11 2023 10:02:19 %S A320080 1,1,0,1,1,0,1,2,1,0,1,3,6,2,0,1,4,15,28,4,0,1,5,28,114,172,14,0,1,6, %T A320080 45,296,1152,1328,38,0,1,7,66,610,4168,14562,12272,216,0,1,8,91,1092, %U A320080 11020,73376,220842,132480,600,0,1,9,120,1778,24084,248870,1550048,3907656,1633344,6240,0 %N A320080 Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f. 1/(1 - k*log(1 + x)). %F A320080 E.g.f. of column k: 1/(1 - k*log(1 + x)). %F A320080 A(n,k) = Sum_{j=0..n} Stirling1(n,j)*j!*k^j. %F A320080 A(0,k) = 1; A(n,k) = k * Sum_{j=1..n} (-1)^(j-1) * (j-1)! * binomial(n,j) * A(n-j,k). - _Seiichi Manyama_, May 22 2022 %e A320080 E.g.f. of column k: A_k(x) = 1 + k*x/1! + k*(2*k - 1)*x^2/2! + 2*k*(3*k^2 - 3*k + 1)*x^3/3! + 2*k*(12*k^3 - 18*k^2 + 11*k - 3)*x^4/4! + ... %e A320080 Square array begins: %e A320080 1, 1, 1, 1, 1, 1, ... %e A320080 0, 1, 2, 3, 4, 5, ... %e A320080 0, 1, 6, 15, 28, 45, ... %e A320080 0, 2, 28, 114, 296, 610, ... %e A320080 0, 4, 172, 1152, 4168, 11020, ... %e A320080 0, 14, 1328, 14562, 73376, 248870, ... %t A320080 Table[Function[k, n! SeriesCoefficient[1/(1 - k Log[1 + x]), {x, 0, n}]][j - n], {j, 0, 10}, {n, 0, j}] // Flatten %Y A320080 Columns k=0..5 give A000007, A006252, A088501, A335531, A354147, A365604. %Y A320080 Main diagonal gives A317172. %Y A320080 Cf. A048594, A048994, A094416, A320079, A334369. %K A320080 nonn,tabl %O A320080 0,8 %A A320080 _Ilya Gutkovskiy_, Oct 05 2018