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A164747 Number of nXnXn triangular 1..3 arrays with all 1s connected, all 2s connected, all 3s connected, 1 at the top vertex, 2 at the lower left, and 3 at the lower right, and no value having more than 5 identical values adjacent 0
1, 17, 171, 1928, 29840, 718188, 28564256 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..8.

EXAMPLE

Some solutions for n=4

......1..........1..........1..........1..........1..........1..........1....

.....2.2........1.3........3.3........1.1........2.1........3.1........3.1...

....2.3.2......1.1.3......2.2.3......1.3.3......2.2.3......3.3.3......3.1.3..

...2.3.3.3....2.1.3.3....2.3.3.3....2.2.3.3....2.2.3.3....2.3.3.3....2.3.3.3.

------

......1..........1..........1..........1..........1..........1..........1....

.....2.1........1.1........1.1........1.1........1.1........3.3........1.1...

....2.2.1......1.1.1......3.3.1......1.2.3......3.3.3......3.3.3......1.1.3..

...2.1.1.3....2.3.3.3....2.3.3.3....2.2.3.3....2.2.2.3....2.2.3.3....2.1.3.3.

CROSSREFS

Sequence in context: A023015 A022645 A326211 * A166579 A142169 A142515

Adjacent sequences: A164744 A164745 A164746 * A164748 A164749 A164750

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 24 2009

STATUS

approved

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Last modified November 28 12:20 EST 2022. Contains 358416 sequences. (Running on oeis4.)