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A151804
Number of n X n binary arrays with rows, considered as binary numbers, in strictly increasing order, and columns, considered as binary numbers, in nondecreasing order, and no more than 4 ones in any row or column.
0
2, 4, 21, 330, 12023, 748612, 69366204, 9069775771, 1608270286843
OFFSET
1,1
CROSSREFS
Sequence in context: A230690 A219745 A151803 * A151805 A151806 A151807
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 27 2009
STATUS
approved