login
A162036
Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and no more than 2 1's in any row.
0
2, 5, 12, 28, 71, 186, 507, 1443, 4241, 12895, 40333, 129679, 427455, 1442384, 4975291, 17518890, 62907021, 230104503, 856679290, 3243467627, 12479244341, 48759284806, 193353224018, 777721210211
OFFSET
1,1
CROSSREFS
Sequence in context: A326760 A238828 A326761 * A321253 A290073 A232534
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 25 2009
STATUS
approved