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A316540 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 4, 7 or 8 king-move adjacent elements, with upper left element zero. 1
4, 12, 26, 53, 187, 484, 1262, 3570, 9751, 26557, 72773, 199700, 546815, 1496934, 4102867, 11240497, 30788845, 84352649, 231098249, 633098685, 1734421624, 4751634729, 13017502145, 35662487018, 97700580311, 267659337870 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A316545.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +3*a(n-2) +8*a(n-3) -a(n-4) -12*a(n-5) -26*a(n-6) -2*a(n-7) +10*a(n-8) +15*a(n-9) -a(n-10) +6*a(n-11) for n>12
EXAMPLE
Some solutions for n=5
..0..1..0. .0..1..1. .0..0..1. .0..0..0. .0..1..1. .0..0..1. .0..0..1
..0..0..1. .0..0..0. .0..0..1. .0..1..0. .0..1..1. .1..1..1. .1..1..1
..0..0..0. .0..1..1. .0..0..0. .0..1..0. .1..1..1. .1..1..1. .1..1..1
..0..0..0. .0..0..0. .0..0..1. .0..0..0. .1..0..1. .0..0..1. .1..1..0
..0..1..1. .0..1..1. .0..1..0. .0..0..0. .1..0..1. .1..1..1. .1..0..1
CROSSREFS
Cf. A316545.
Sequence in context: A057307 A009844 A264100 * A066185 A330704 A239940
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 06 2018
STATUS
approved

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Last modified June 15 13:08 EDT 2024. Contains 373407 sequences. (Running on oeis4.)