A276249 Number of 3 X n 0..2 arrays with no element equal to any value at offset (-2,-1) (-1,1) or (0,-2) and new values introduced in order 0..2.

5, 36, 85, 279, 900, 2837, 9148, 29570, 95102, 306540, 989092, 3188130, 10278456, 33146672, 106872610, 344585885, 1111106822, 3582609009, 11551580944, 37246820838, 120097695423, 387239261828, 1248605509417, 4025972358284

Offset: 1

Author

R. H. Hardin, Aug 25 2016

Keywords

• nonn

Comments

Row 3 of A276248.

Examples

			Some solutions for n=4
..0..1..1..2. .0..1..1..0. .0..0..1..2. .0..1..2..2. .0..1..2..0
..2..2..0..1. .0..0..1..2. .2..2..1..0. .0..1..1..2. .2..0..1..1
..1..2..0..0. .2..2..0..0. .0..2..1..0. .2..2..0..1. .1..2..0..0
		

Links

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

Crossrefs

Cf. A276248.

Formula

Empirical: a(n) = 2*a(n-1) +3*a(n-2) +8*a(n-3) -10*a(n-4) -21*a(n-5) +17*a(n-7) +12*a(n-8) -17*a(n-9) +2*a(n-10) +3*a(n-11) +3*a(n-12) -a(n-14) for n>15.