A270262 Number of 7X7X7 triangular 0..n arrays with some element plus some adjacent element totalling n exactly once.

0, 601368, 168922341960, 754152642763392, 1217128601064427992, 328713317385409802664, 44017120053171675291312, 2562731765801885593512960, 96219147569870302189360080

Offset

1,2

Comments

Row 7 of A270256.

Links

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

Example

Some solutions for n=2
........0..............0..............0..............0..............0
.......0.1............1.0............0.0............0.0............0.1
......0.0.0..........0.1.0..........0.0.0..........0.0.0..........1.0.0
.....0.1.0.0........0.0.0.1........0.1.1.0........0.0.0.0........0.0.1.0
....1.0.0.1.0......1.0.0.0.0......0.0.0.0.0......0.0.0.0.1......0.0.1.0.1
...0.0.0.0.0.0....0.0.0.1.0.1....0.0.0.0.0.1....0.0.0.0.1.0....0.1.0.0.0.0
..0.0.1.1.0.1.0..1.0.1.0.0.0.0..1.0.1.0.0.0.0..0.0.1.0.0.0.0..1.0.0.0.1.0.0

Crossrefs

Cf. A270256.

Sequence in context: A206412 A235257 A185928 * A238310 A237471 A251070

Adjacent sequences: A270259 A270260 A270261 * A270263 A270264 A270265

Keyword

nonn

Author

R. H. Hardin, Mar 14 2016

Status

approved