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A185471 Number of (n+2)X5 0..2 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order 1
13659, 76309, 308692, 1043186, 3097348, 8297059, 20411234, 46732687, 100636591, 205574323, 401123377, 751921908, 1360579387, 2385984676, 4068843506, 6766785098, 11002001311, 17525142877, 27400120766, 42115574722, 63730107482 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A185477

LINKS

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

FORMULA

Empirical: a(n) = (1/444787200)*n^13

+ (107/479001600)*n^12

+ (11/1088640)*n^11

+ (3623/6220800)*n^10

+ (78227/3628800)*n^9

+ (6420917/14515200)*n^8

+ (148481/27216)*n^7

+ (1861160843/43545600)*n^6

+ (4966108109/21772800)*n^5

+ (1448539279/1555200)*n^4

+ (3663351401/1330560)*n^3

+ (2013261953/415800)*n^2

+ (15650889/3640)*n

+ 556

EXAMPLE

Some solutions for 4X5

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

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

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

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

CROSSREFS

Sequence in context: A206091 A218456 A224971 * A203727 A088870 A047827

Adjacent sequences:  A185468 A185469 A185470 * A185472 A185473 A185474

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 28 2011

STATUS

approved

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Last modified August 19 11:05 EDT 2022. Contains 356228 sequences. (Running on oeis4.)