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A183408 Number of n X n binary arrays with each sum of a(1..i,1..j) no greater than i*j/2 and rows and columns in nondecreasing order 0
1, 5, 22, 380, 11499, 1497764, 408834576, 475512062908 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A183413

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for 4X4

..0..0..1..1....0..0..0..1....0..0..0..1....0..0..0..0....0..0..0..0

..0..1..0..0....0..0..0..1....0..0..1..0....0..0..0..0....0..0..1..1

..0..1..0..0....0..0..0..1....0..1..1..0....0..1..1..1....0..0..1..1

..1..1..0..0....0..0..1..1....1..0..1..0....1..0..0..0....0..1..1..1

CROSSREFS

Sequence in context: A066865 A183902 A005632 * A298322 A299215 A300031

Adjacent sequences:  A183405 A183406 A183407 * A183409 A183410 A183411

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2011

STATUS

approved

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Last modified April 8 21:44 EDT 2020. Contains 333329 sequences. (Running on oeis4.)