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A270505

Number of nXnXn triangular 0..3 arrays with some element plus some adjacent element totalling 3+1 exactly once.

0, 21, 1137, 132474, 34889103, 22383193638, 35714928884139, 144182981347081503, 1486449414781831854123, 39397028534591054436055983, 2696910972157269626108160017520, 478461426234650496975341723139740316

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OFFSET

1,2

COMMENTS

Column 3 of A270509.

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=4

.....3........1........0........0........0........2........0........0

....0.3......2.0......1.1......2.1......1.1......0.2......0.0......0.0

...0.2.1....0.1.0....2.0.2....0.1.0....0.1.2....1.0.1....3.3.3....3.2.1

..1.1.1.1..2.0.3.2..0.3.3.1..3.1.0.2..0.0.3.3..0.0.0.2..3.2.2.0..3.0.0.3

CROSSREFS

Cf. A270509.

Sequence in context: A012183 A012230 A357314 * A086098 A086875 A012211

Adjacent sequences: A270502 A270503 A270504 * A270506 A270507 A270508

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 18 2016

STATUS

approved

URL: https://oeis.org/A270505

⇱ A270505 - OEIS