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A151802 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 2 ones in any row or column. 0
2, 4, 13, 54, 257, 1384, 8303, 54674, 390943, 3009943, 24782522, 216985032, 2010748246, 19641718283, 201551129440 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..15.

CROSSREFS

Sequence in context: A030970 A030842 A191293 * A030901 A030939 A030886

Adjacent sequences:  A151799 A151800 A151801 * A151803 A151804 A151805

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 27 2009

STATUS

approved

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Last modified March 3 10:45 EST 2021. Contains 341762 sequences. (Running on oeis4.)