A270845 Number of nXnXn triangular 0..3 arrays with some element plus some adjacent element totalling 3+1, 3 or 3-1 exactly once.

0, 6, 30, 252, 2298, 28440, 460494, 10076742, 298685550, 12084696450, 669841797084, 51029625915420, 5355630042866478, 775782157115299926, 155330231799053130042, 43040564062668109646964

Offset

1,2

Comments

Column 3 of A270850.

Links

R. H. Hardin, Table of n, a(n) for n = 1..24

Example

Some solutions for n=4
.....0........2........0........3........2........2........2........3
....1.0......3.3......0.0......3.3......3.3......3.3......3.2......3.3
...0.0.0....3.3.2....1.0.0....3.3.2....3.3.2....2.3.2....2.3.3....2.3.3
..1.0.1.1..2.2.3.3..0.0.1.1..2.3.2.3..2.3.3.2..3.2.3.3..3.3.3.3..3.3.2.2

Crossrefs

Cf. A270850.

Sequence in context: A366809 A133668 A121772 * A277073 A052585 A304188

Adjacent sequences: A270842 A270843 A270844 * A270846 A270847 A270848

Keyword

nonn

Author

R. H. Hardin, Mar 24 2016

Status

approved