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A226987
Number of n X n 0..4 arrays of sums of 2X2 subblocks of some (n+1)X(n+1) binary array with rows and columns of the latter in lexicographically nondecreasing order
0
5, 42, 608, 24158, 2601925, 833294380, 816606210291, 2510846575278844
OFFSET
1,1
COMMENTS
Diagonal of A226992
EXAMPLE
Some solutions for n=4
..1..2..2..2....1..2..2..3....1..2..2..3....0..0..1..3....0..0..1..2
..2..4..4..2....2..1..1..3....2..2..2..2....0..1..2..2....1..2..2..2
..2..4..4..3....2..1..2..3....2..0..2..2....1..2..1..0....2..4..2..2
..2..2..3..3....3..3..2..2....2..0..2..3....2..2..0..1....3..4..2..2
CROSSREFS
Sequence in context: A323313 A363435 A337593 * A336605 A204235 A188405
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 25 2013
STATUS
approved