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A155433 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 2,2 3,0 3,3 4,1 4,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 4, 13, 28, 49, 76, 487, 3766, 20956, 91261, 385483, 3099937, 40032793, 511624885, 5661397930, 61479664849, 927273309259, 20003424034360, 509150633289499, 13132668672579046, 346049894030528596 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..24.

EXAMPLE

Maximal 10 X 10 X 10 example

............0

...........0.0

..........1.1.1

.........1.0.0.1

........0.0.0.1.0

.......0.0.1.1.0.0

......1.1.0.0.0.1.1

.....1.0.0.0.0.0.0.1

....1.0.0.1.0.1.0.0.1

...0.1.1.1.0.0.1.1.1.0

CROSSREFS

Sequence in context: A298017 A307272 A056107 * A272746 A273557 A272790

Adjacent sequences:  A155430 A155431 A155432 * A155434 A155435 A155436

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified August 12 15:13 EDT 2022. Contains 356077 sequences. (Running on oeis4.)