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A267991 Number of 2Xn arrays containing n copies of 0..2-1 with row sums and column sums nondecreasing. 1
1, 4, 5, 15, 21, 57, 85, 220, 341, 858, 1365, 3368, 5461, 13276, 21845, 52479, 87381, 207861, 349525, 824527, 1398101, 3274395, 5592405, 13015081, 22369621, 51769813, 89478485, 206045841, 357913941, 820475513, 1431655765, 3268499356, 5726623061 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 2 of A267990.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=8

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

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

CROSSREFS

Cf. A267990.

Sequence in context: A007390 A037955 A225121 * A225536 A084179 A026634

Adjacent sequences:  A267988 A267989 A267990 * A267992 A267993 A267994

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 23 2016

STATUS

approved

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Last modified November 17 23:26 EST 2019. Contains 329242 sequences. (Running on oeis4.)