OFFSET
0,3
COMMENTS
a(n) is the number of elements (ordered pairs) in all binary relations on {1,2,...,n}.
Equivalently a(n) is the number of 1's in all n X n {0,1} matrices.
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..57
MATHEMATICA
Table[n^2 *2^(n^2-1), {n, 0, 10}]
PROG
(PARI) for(n=0, 25, print1(n^2 *2^(n^2-1), ", ")) \\ G. C. Greubel, Jul 23 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Geoffrey Critzer, Feb 07 2011
STATUS
approved