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A216931 Number of side-n hexagonal 0..2 arrays with values nondecreasing E, SW and SE. 1
3, 53, 1211, 27768, 618013, 13312100, 278398992, 5675814840, 113227696037, 2217264763644, 42732777814040, 812306057415128, 15256867582390896, 283555814061437456, 5221245121601899736, 95350283688266563344 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A216937.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..43

EXAMPLE

Some solutions for n=3:

......0.0.0..........0.0.1..........0.0.0..........0.0.1..........0.0.0

.....0.0.0.1........0.1.1.1........0.0.0.0........0.0.1.1........0.1.1.2

....0.0.0.1.2......0.1.1.2.2......0.0.0.0.1......0.1.1.1.2......1.1.1.2.2

.....1.1.1.2........2.2.2.2........0.0.0.2........1.1.2.2........1.1.2.2

......2.2.2..........2.2.2..........0.0.2..........2.2.2..........1.2.2

CROSSREFS

Sequence in context: A203561 A333563 A273802 * A012742 A012823 A098932

Adjacent sequences:  A216928 A216929 A216930 * A216932 A216933 A216934

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 20 2012

STATUS

approved

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Last modified January 23 11:42 EST 2022. Contains 350512 sequences. (Running on oeis4.)