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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.)