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A151801 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. 5
2, 4, 21, 330, 14610, 1820715, 653629616, 696496706166, 2267861968974085, 23151301116946350437, 757490164568070202377310, 80950840941871760357231324684 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..12.

R. H. Hardin, Binary arrays with both rows and cols sorted, symmetries

CROSSREFS

Sequence in context: A151807 A151808 A151809 * A284920 A254221 A298471

Adjacent sequences:  A151798 A151799 A151800 * A151802 A151803 A151804

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 27 2009

STATUS

approved

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Last modified February 24 13:13 EST 2021. Contains 341569 sequences. (Running on oeis4.)