cp's OEIS Frontend

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.

A336187 Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where T(n,k) = Sum_{j=0..n} k^j * binomial(n,j)^k.

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%I A336187 #12 Jul 11 2020 07:34:02
%S A336187 1,1,1,1,2,1,1,3,4,1,1,4,13,8,1,1,5,34,63,16,1,1,6,81,352,321,32,1,1,
%T A336187 7,186,1685,3946,1683,64,1,1,8,421,7416,38401,46744,8989,128,1,1,9,
%U A336187 946,30835,328146,963525,573616,48639,256,1,1,10,2113,122816,2590225,16971876,25346385,7217536,265729,512,1
%N A336187 Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where T(n,k) = Sum_{j=0..n} k^j * binomial(n,j)^k.
%C A336187 Column k is the diagonal of the rational function 1 / (Product_{j=1..k} (1-x_j) - k * Product_{j=1..k} x_j) for k>0.
%e A336187 Square array begins:
%e A336187   1,  1,    1,     1,      1,        1, ...
%e A336187   1,  2,    3,     4,      5,        6, ...
%e A336187   1,  4,   13,    34,     81,      186, ...
%e A336187   1,  8,   63,   352,   1685,     7416, ...
%e A336187   1, 16,  321,  3946,  38401,   328146, ...
%e A336187   1, 32, 1683, 46744, 963525, 16971876, ...
%t A336187 Unprotect[Power]; 0^0 = 1; T[n_, k_] := Sum[ k^j*Binomial[n, j]^k, {j, 0, n}]; Table[T[k, n - k], {n, 0, 10}, {k, 0, n}] // Flatten (* _Amiram Eldar_, Jul 11 2020 *)
%Y A336187 Columns k=0-3 give: A000012, A000079, A001850, A206180.
%Y A336187 Main diagonal gives A336188.
%Y A336187 Cf. A307883, A336163.
%K A336187 nonn,tabl
%O A336187 0,5
%A A336187 _Seiichi Manyama_, Jul 11 2020