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A164746 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 4 identical values adjacent 0
1, 17, 159, 1448, 16770, 293511, 8049711 (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....

.....1.1........2.2........1.1........3.3........1.1........3.3........3.1...

....2.1.3......2.3.2......2.2.1......3.2.3......1.2.2......2.2.3......2.3.1..

...2.1.1.3....2.3.3.3....2.2.1.3....2.2.3.3....2.2.3.3....2.3.3.3....2.3.3.3.

------

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

.....1.1........3.1........2.1........2.3........2.1........1.1........1.2...

....1.1.3......3.3.1......2.2.2......2.2.3......2.2.3......1.2.1......1.2.3..

...2.2.2.3....2.2.3.3....2.2.3.3....2.3.3.3....2.3.3.3....2.2.2.3....2.2.3.3.

CROSSREFS

Sequence in context: A176622 A125380 A126538 * A198859 A160295 A125645

Adjacent sequences: A164743 A164744 A164745 * A164747 A164748 A164749

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 24 2009

STATUS

approved

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Last modified February 3 15:17 EST 2023. Contains 360035 sequences. (Running on oeis4.)