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A270504 Number of nXnXn triangular 0..2 arrays with some element plus some adjacent element totalling 2+1 exactly once. 1
0, 6, 144, 5406, 369072, 47829828, 12072484260, 6018099563412, 5978376752357856, 11906720428681033194, 47747190052669169665500, 386741181278527199554452264, 6342331030790597545544573997684 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 2 of A270509.
LINKS
EXAMPLE
Some solutions for n=4
.....2........1........0........2........0........1........1........1
....0.1......0.0......0.1......0.0......0.1......1.0......2.0......1.1
...0.1.1....0.0.2....0.0.0....1.1.1....2.2.0....1.1.0....0.0.0....1.1.0
..0.1.1.0..1.1.1.0..1.2.2.0..1.0.0.2..0.2.0.2..2.0.0.1..0.1.1.1..0.0.2.0
CROSSREFS
Cf. A270509.
Sequence in context: A197178 A208230 A010043 * A085905 A203978 A090443
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 18 2016
STATUS
approved

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Last modified June 24 19:44 EDT 2024. Contains 373690 sequences. (Running on oeis4.)