A270605 Number of nXnXn triangular 0..7 arrays with some element plus some adjacent element totalling 7+1 or 7-1 exactly once.

0, 204, 67788, 70129212, 271906503420, 4288332432901128, 285369749616515150016, 81692982509404218523971864

Offset

1,2

Comments

Column 7 of A270606.

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=3
....4......4......6......6......3......7......1......0......3......0......5
...7.1....1.1....6.4....5.7....1.1....7.0....3.0....2.5....6.5....5.6....0.4
..4.3.2..7.3.0..6.4.5..0.2.1..1.0.7..2.4.7..2.4.1..0.1.2..6.5.2..4.6.3..0.4.7

Crossrefs

Cf. A270606.

Sequence in context: A194192 A339199 A263505 * A072573 A249052 A116177

Adjacent sequences: A270602 A270603 A270604 * A270606 A270607 A270608

Keyword

nonn

Author

R. H. Hardin, Mar 20 2016

Status

approved