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 A283675 #35 Nov 06 2017 01:24:52 %S A283675 1,1,-1,1,-1,-1,1,-1,-4,0,1,-1,-16,-23,0,1,-1,-64,-713,-223,1,1,-1, %T A283675 -256,-19619,-64687,-2767,0,1,-1,-1024,-531185,-16755517,-9688545, %U A283675 -42268,1,1,-1,-4096,-14347883,-4294403215,-30499543213,-2165715003,-759008,0,1,-1,-16384 %N A283675 Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of Product_{j>=1} (1-x^j)^(j^(k*j)) in powers of x. %H A283675 Seiichi Manyama, <a href="/A283675/b283675.txt">Antidiagonals n = 0..52, flattened</a> %F A283675 G.f. of column k: Product_{j>=1} (1-x^j)^(j^(k*j)). %F A283675 A(0,k) = 1 and A(n,k) = -(1/n) * Sum_{j=1..n} (Sum_{d|j} d^(k*d+1)) * A(n-j,k) for n > 0. - _Seiichi Manyama_, Nov 04 2017 %e A283675 Square array begins: %e A283675 1, 1, 1, 1, ... %e A283675 -1, -1, -1, -1, ... %e A283675 -1, -4, -16, -64, ... %e A283675 0, -23, -713, -19619, ... %e A283675 0, -223, -64687, -16755517, ... %Y A283675 Columns k=0..4 give A010815, A283499, A283534, A283536, A283803. %Y A283675 Rows n=0..1 give A000012, (-1)*A000012. %Y A283675 Main diagonal gives A283720. %Y A283675 Cf. A283674. %K A283675 sign,tabl %O A283675 0,9 %A A283675 _Seiichi Manyama_, Mar 14 2017