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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
OFFSET
1,1
COMMENTS
Column 2 of A216937.
LINKS
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 * A352992 A012742 A012823
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 20 2012
STATUS
approved