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 A293134 #20 Oct 01 2017 00:27:31 %S A293134 1,1,-1,1,0,3,1,0,-2,-13,1,0,0,6,73,1,0,0,-6,-12,-501,1,0,0,0,24,0, %T A293134 4051,1,0,0,0,-24,-120,240,-37633,1,0,0,0,0,120,1080,-2520,394353,1,0, %U A293134 0,0,0,-120,-720,-10080,21840,-4596553,1,0,0,0,0,0,720,5040,100800 %N A293134 Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f. exp(-x^(k+1)/(1+x)). %H A293134 Seiichi Manyama, <a href="/A293134/b293134.txt">Antidiagonals n = 0..139, flattened</a> %F A293134 A(0,k) = 1, A(1,k) = A(2,k) = ... = A(k,k) = 0 and A(n,k) = (-1)^(k+1) * Sum_{i=k..n-1} (-1)^i*(i+1)!*binomial(n-1,i)*A(n-1-i,k) for n > k. %e A293134 Square array begins: %e A293134 1, 1, 1, 1, ... %e A293134 -1, 0, 0, 0, ... %e A293134 3, -2, 0, 0, ... %e A293134 -13, 6, -6, 0, ... %e A293134 73, -12, 24, -24, ... %e A293134 -501, 0, -120, 120, ... %Y A293134 Columns k=0..2 give A293125, A293122, A293123. %Y A293134 Rows n=0..1 give A000012, (-1)*A000007. %Y A293134 Main diagonal gives A000007. %Y A293134 A(n,n-1) gives (-1)*A000142(n). %Y A293134 Cf. A293053, A293119, A293133. %K A293134 sign,tabl %O A293134 0,6 %A A293134 _Seiichi Manyama_, Sep 30 2017