A268027 Number of 3Xn 0..2 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value.

24, 576, 13824, 295962, 6042732, 117582228, 2205234900, 40088968398, 709841497188, 12287419441812, 208546228493724, 3478737714576768, 57143989099923852, 925889151644801202, 14817867358400405148

Offset: 1

Author

R. H. Hardin, Jan 24 2016

Keywords

• nonn

Comments

Row 3 of A268026.

Examples

			Some solutions for n=3
..1..2..1....1..2..0....0..0..2....1..1..2....2..0..0....2..1..1....0..2..2
..0..2..1....0..1..1....1..1..0....1..2..0....1..2..0....1..0..2....2..1..2
..2..0..2....2..2..1....1..1..2....0..0..1....1..1..1....1..0..1....2..1..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 86

Crossrefs

Cf. A268026.

Formula

Empirical recurrence of order 86 (see link above)