A286418 - OEIS

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A286418

Array read by antidiagonals: T(n,m) is the number of (undirected) cycles in the rook graph K_n X K_m.

0, 0, 0, 1, 1, 1, 7, 14, 14, 7, 37, 170, 312, 170, 37, 197, 2904, 13945, 13945, 2904, 197, 1172, 74779, 1241696, 3228524, 1241696, 74779, 1172, 8018, 2751790, 196846257, 1723178763, 1723178763, 196846257, 2751790, 8018

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

1,7

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..78

Eric Weisstein's World of Mathematics, Graph Cycle, Rook Graph

EXAMPLE

Table starts:

================================================

m\n 1 2 3 4 5

--+---------------------------------------------

1 | 0 0 1 7 37 ...