A271039 Number of 7X7X7 triangular 0..n arrays with some element less than a w, nw or ne neighbor exactly once.

642, 56754, 2173554, 50108414, 804566180, 9790184488, 95420380090, 774600507974, 5391017644856, 32890239598008, 179007489630476, 881467345491584, 3972721376352724, 16545720243662726, 64195774252619306

Offset: 1

Author

R. H. Hardin, Mar 29 2016

Keywords

• nonn

Comments

Row 7 of A271034.

Examples

			Some solutions for n=2
........0..............0..............0..............0..............0
.......0.0............0.0............0.0............0.1............0.0
......0.0.0..........0.2.2..........0.1.1..........0.1.1..........0.0.0
.....0.0.1.0........1.1.2.2........0.1.1.1........0.0.2.2........0.0.1.1
....0.1.1.1.2......1.1.2.2.2......1.1.2.1.2......0.0.2.2.2......1.1.1.1.1
...0.1.1.1.2.2....1.1.2.2.2.2....2.2.2.2.2.2....0.1.2.2.2.2....0.1.1.1.1.1
..0.2.2.2.2.2.2..1.1.2.2.2.2.2..2.2.2.2.2.2.2..0.1.2.2.2.2.2..1.2.2.2.2.2.2
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..18

Crossrefs

Cf. A271034.