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A305283 Number of nX3 0..1 arrays with every element unequal to 1, 2, 3, 4 or 8 king-move adjacent elements, with upper left element zero. 1
1, 23, 55, 279, 895, 3696, 13289, 51734, 192418, 735241, 2765966, 10501378, 39658770, 150239389, 568125614, 2150618007, 8136093736, 30791019947, 116504256865, 440871748994, 1668215077887, 6312621082911, 23886745061996 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 3 of A305288.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +11*a(n-2) +5*a(n-3) -19*a(n-4) -23*a(n-5) -2*a(n-6) -14*a(n-7) -16*a(n-8) -19*a(n-9) -12*a(n-10) -a(n-11) -6*a(n-12) +3*a(n-13) -a(n-14) +2*a(n-15) for n>16
EXAMPLE
Some solutions for n=5
..0..0..0. .0..0..1. .0..1..0. .0..0..0. .0..0..0. .0..0..1. .0..1..0
..1..0..1. .1..0..1. .1..1..1. .0..1..1. .0..1..0. .1..1..1. .1..0..1
..0..1..1. .0..1..0. .0..1..1. .1..1..1. .0..0..0. .0..1..0. .0..0..0
..1..0..0. .1..1..1. .1..0..1. .1..1..0. .0..0..0. .0..1..0. .0..0..0
..0..0..1. .0..1..0. .0..0..0. .1..0..0. .1..1..1. .1..1..1. .1..0..1
CROSSREFS
Cf. A305288.
Sequence in context: A303891 A264117 A033657 * A166144 A007795 A153353
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 29 2018
STATUS
approved

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Last modified July 13 04:46 EDT 2024. Contains 374267 sequences. (Running on oeis4.)