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A276249 Number of 3Xn 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 (list; graph; refs; listen; history; text; internal format)
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: A003350 A217166 A275143 * A027765 A196481 A096945

Adjacent sequences:  A276246 A276247 A276248 * A276250 A276251 A276252

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 25 2016

STATUS

approved

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Last modified May 23 07:08 EDT 2019. Contains 323508 sequences. (Running on oeis4.)