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A271029 Number of nXnXn triangular 0..3 arrays with some element less than a w, nw or ne neighbor exactly once. 1
0, 20, 294, 3114, 29120, 256020, 2173554, 18060096, 147976270, 1201034302, 9684108034, 77719446198, 621623562780, 4959585660212, 39496945637162, 314112558505488, 2495519478658458, 19810840820555514, 157179628657888198 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 3 of A271034.
LINKS
EXAMPLE
Some solutions for n=4
.....3........0........0........1........1........0........0........0
....0.3......0.2......0.0......1.1......1.1......0.2......0.2......1.0
...0.3.3....1.3.3....0.0.1....1.3.2....0.2.2....0.2.2....1.2.2....1.3.3
..0.3.3.3..1.2.3.3..2.1.1.3..1.3.3.3..1.2.2.3..1.1.2.3..2.3.2.2..3.3.3.3
CROSSREFS
Cf. A271034.
Sequence in context: A016309 A190824 A016259 * A047795 A223956 A132168
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 29 2016
STATUS
approved

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Last modified March 28 14:13 EDT 2024. Contains 371254 sequences. (Running on oeis4.)