A270856 Number of 7 X 7 X 7 triangular 0..n arrays with some element plus some adjacent element totalling n+1, n or n-1 exactly once.

0, 0, 460494, 4875050400, 5281372355106, 2104222937252028, 358240737864481086, 41234776662339168204, 2798233542174582927894, 142439611138184581460718

Offset

1,3

Comments

Row 7 of A270850.

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=3
........0..............1..............1..............0..............1
.......0.1............0.1............0.0............0.1............0.0
......1.0.0..........0.0.0..........1.0.1..........0.0.0..........0.0.0
.....0.0.0.1........0.0.0.1........1.0.0.0........1.0.0.0........0.0.0.0
....0.0.0.1.0......0.0.0.0.0......0.0.1.0.1......0.1.0.0.0......0.0.0.1.0
...0.1.0.0.0.1....0.1.0.0.0.0....0.1.0.0.0.0....0.0.0.1.0.0....0.0.0.0.0.1
..1.0.0.0.1.0.0..0.0.0.0.0.0.1..1.0.0.1.0.0.1..1.0.0.0.0.0.1..0.0.0.0.0.1.0

Crossrefs

Cf. A270850.

Sequence in context: A274811 A202600 A114671 * A295475 A205765 A216068

Adjacent sequences: A270853 A270854 A270855 * A270857 A270858 A270859

Keyword

nonn

Author

R. H. Hardin, Mar 24 2016

Status

approved