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A224260 Number of n X 6 0..2 arrays with rows and antidiagonals unimodal and columns nondecreasing. 1
148, 4102, 40182, 240829, 1122522, 4480391, 15921905, 51343083, 152072846, 417672794, 1072431538, 2592681873, 5938784236, 12959932409, 27074244297, 54373767111, 105367428574, 197658533498, 359961664018, 638001956409 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A224262.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = (761/8553600)*n^12 + (1733/3326400)*n^11 + (4339/388800)*n^10 + (1187/17280)*n^9 + (917087/1814400)*n^8 + (72307/25200)*n^7 + (1789211/194400)*n^6 + (1748533/24192)*n^5 + (3929747/97200)*n^4 + (7565567/21600)*n^3 - (359937251/415800)*n^2 - (7897829/2310)*n + 10655 for n>6.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Cf. A224262.

Sequence in context: A178264 A121280 A338970 * A223916 A224188 A223931

Adjacent sequences:  A224257 A224258 A224259 * A224261 A224262 A224263

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 02 2013

STATUS

approved

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Last modified August 8 18:58 EDT 2022. Contains 356016 sequences. (Running on oeis4.)