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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 02 2013
STATUS
approved

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Last modified July 19 02:27 EDT 2024. Contains 374388 sequences. (Running on oeis4.)