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A185470 Number of (n+2)X4 0..2 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order 1
4594, 21834, 76309, 225672, 594798, 1433903, 3212372, 6763143, 13496424, 25706057, 46997040, 82868632, 141494158, 234746166, 379524035, 599450565, 927014574, 1406248164, 2096040183, 3074201592, 4442414038, 6332210033 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A185477

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = (1/9979200)*n^11

+ (29/3628800)*n^10

+ (257/241920)*n^9

+ (4621/120960)*n^8

+ (400927/604800)*n^7

+ (1134257/172800)*n^6

+ (31386443/725760)*n^5

+ (20355493/90720)*n^4

+ (80111509/100800)*n^3

+ (40459121/25200)*n^2

+ (7603747/4620)*n

+ 273

EXAMPLE

Some solutions for 6X4

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

..0..0..0..1....0..0..0..1....0..0..0..1....0..0..0..2....0..0..0..1

..0..0..1..1....0..0..1..2....0..0..0..2....0..0..1..1....0..0..0..1

..0..0..1..2....0..0..1..2....0..0..1..2....1..1..2..2....0..0..1..1

..0..0..1..2....0..1..1..1....0..1..2..1....1..2..1..2....0..1..0..1

..0..0..2..1....1..1..2..1....1..2..2..1....1..2..2..0....2..2..2..1

CROSSREFS

Sequence in context: A205231 A231022 A251385 * A004537 A204655 A204652

Adjacent sequences:  A185467 A185468 A185469 * A185471 A185472 A185473

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 28 2011

STATUS

approved

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Last modified December 6 10:24 EST 2021. Contains 349563 sequences. (Running on oeis4.)