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A317225 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3, 6, 7 or 8 king-move adjacent elements, with upper left element zero. 1
4, 21, 46, 150, 488, 1468, 4626, 14720, 45811, 143798, 453581, 1423094, 4469903, 14063611, 44197158, 138899518, 436737933, 1372924949, 4315682539, 13567748610, 42653241731, 134086614407, 421533391249, 1325188322229, 4166003679092 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A317230.
LINKS
FORMULA
Empirical: a(n) = 3*a(n-1) +a(n-2) +7*a(n-3) -22*a(n-4) -23*a(n-5) +8*a(n-6) +29*a(n-7) +22*a(n-8) -20*a(n-9) -10*a(n-10) for n>12
EXAMPLE
Some solutions for n=5
..0..1..1. .0..0..1. .0..0..1. .0..0..0. .0..1..1. .0..0..1. .0..0..1
..1..1..1. .0..0..0. .0..1..0. .0..1..1. .0..1..1. .0..0..0. .1..0..1
..1..1..1. .0..1..0. .0..1..0. .0..1..0. .1..0..1. .0..1..0. .1..1..1
..1..0..1. .0..1..0. .0..0..0. .0..0..0. .1..1..1. .0..0..0. .1..0..0
..0..0..1. .0..0..0. .1..0..1. .1..0..1. .0..1..0. .1..0..0. .1..1..0
CROSSREFS
Cf. A317230.
Sequence in context: A306048 A266149 A042223 * A273780 A033569 A201446
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 24 2018
STATUS
approved

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Last modified March 29 01:36 EDT 2024. Contains 371264 sequences. (Running on oeis4.)