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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A226992

LINKS

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

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: A239997 A102244 A323313 * A204235 A188405 A216334

Adjacent sequences:  A226984 A226985 A226986 * A226988 A226989 A226990

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 25 2013

STATUS

approved

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Last modified April 19 01:29 EDT 2019. Contains 322237 sequences. (Running on oeis4.)