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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.
1
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 25 2016
STATUS
approved