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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
OFFSET
1,2
COMMENTS
Row 2 of A267990.
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 23 2016
STATUS
approved