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A185472 Number of (n+2)X6 0..2 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order 1
34779, 225672, 1043186, 3959167, 12990375, 37961900, 100908633, 247920339, 570069808, 1239033996, 2565887950, 5095678058, 9756244258, 18087995239, 32592776835, 57255685167, 98315034745, 165384433476, 273069215898 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A185477

LINKS

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

FORMULA

Empirical: a(n) = (1/27243216000)*n^15

+ (97/21794572800)*n^14

+ (1549/6227020800)*n^13

+ (4127/479001600)*n^12

+ (676031/2395008000)*n^11

+ (54763/6220800)*n^10

+ (60678553/304819200)*n^9

+ (904333037/304819200)*n^8

+ (910283537/31104000)*n^7

+ (8446896821/43545600)*n^6

+ (213392977159/239500800)*n^5

+ (52396736149/17107200)*n^4

+ (70560211894163/9081072000)*n^3

+ (1840763445463/151351200)*n^2

+ (1738288907/180180)*n

+ 1019

EXAMPLE

Some solutions for 4X6

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

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

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

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

CROSSREFS

Sequence in context: A256900 A236141 A103911 * A116016 A253117 A236591

Adjacent sequences:  A185469 A185470 A185471 * A185473 A185474 A185475

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 28 2011

STATUS

approved

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Last modified July 5 15:05 EDT 2022. Contains 355099 sequences. (Running on oeis4.)