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

1,1

Comments

Row 3 of A276248.

Links

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

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.

Example

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

Crossrefs

Cf. A276248.

Sequence in context: A344643 A217166 A275143 * A027765 A196481 A096945

Adjacent sequences: A276246 A276247 A276248 * A276250 A276251 A276252

Keyword

nonn

Author

R. H. Hardin, Aug 25 2016

Status

approved