OFFSET
0,12
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..275
Eric Weisstein's World of Mathematics, Maximal Independent Edge Set
Eric Weisstein's World of Mathematics, Rook Graph
FORMULA
T(n,m) = T(m,n).
EXAMPLE
Array begins:
=============================================================
n\m | 0 1 2 3 4 5 6
----+--------------------------------------------------------
0 | 1 1 1 1 1 1 1 ...
1 | 1 1 1 3 3 15 15 ...
2 | 1 1 2 10 40 296 1576 ...
3 | 1 3 10 84 852 11580 197640 ...
4 | 1 3 40 852 22368 822528 38772864 ...
5 | 1 15 296 11580 822528 84961440 12002446080 ...
6 | 1 15 1576 197640 38772864 12002446080 5429866337280 ...
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Andrew Howroyd, Feb 21 2021
STATUS
approved