login
A162037
Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and no more than 3 ones in any row
0
2, 5, 17, 69, 309, 1668, 10056, 66792, 487097, 3831282, 32364784, 291650388, 2787435921, 28151860269, 299220983205, 3336621374511, 38927257377509
OFFSET
1,1
CROSSREFS
Sequence in context: A211387 A372376 A303952 * A319467 A326412 A183239
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 25 2009
STATUS
approved