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A185426 Number of (n+2)X(n+2) 0..7 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order 0
6842284, 21536560306, 84722449466168, 378372621022753476, 1812817799965228636502, 9008824580891342846197566, 45497009931939204350899288292 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A185435

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for 4X4

..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0

..0..0..0..4....0..0..0..0....0..0..0..0....0..0..0..4....0..0..0..4

..0..1..5..2....0..1..4..6....0..0..0..2....0..0..7..3....0..0..6..6

..0..3..7..5....0..2..7..1....2..4..6..5....0..5..4..5....0..7..2..0

CROSSREFS

Sequence in context: A079015 A185435 A185427 * A250457 A251982 A323497

Adjacent sequences:  A185423 A185424 A185425 * A185427 A185428 A185429

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 27 2011

STATUS

approved

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Last modified May 31 02:51 EDT 2020. Contains 334747 sequences. (Running on oeis4.)