A270849 Number of nXnXn triangular 0..7 arrays with some element plus some adjacent element totalling 7+1, 7 or 7-1 exactly once.

0, 198, 24954, 8559378, 8746813158, 29999932959600, 358240737864481086, 15211541078680656195678, 2316320467474669254077347692

Offset

1,2

Comments

Column 7 of A270850.

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=3
....5......3......6......2......0......5......0......4......5......2......7
...5.6....2.0....3.1....0.5....0.5....3.6....5.5....0.7....7.5....7.5....0.2
..5.4.3..3.2.4..2.2.2..0.5.4..1.3.0..7.7.3..4.7.0..5.5.7..7.7.3..5.7.7..1.2.1

Crossrefs

Cf. A270850.

Sequence in context: A290933 A278017 A348602 * A324454 A097731 A006243

Adjacent sequences: A270846 A270847 A270848 * A270850 A270851 A270852

Keyword

nonn

Author

R. H. Hardin, Mar 24 2016

Status

approved