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A303097 Number of n X 3 0..1 arrays with every element equal to 1, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
1, 15, 77, 486, 2869, 17229, 102952, 616065, 3685099, 22045482, 131879323, 788928513, 4719516650, 28233043741, 168895389127, 1010364108842, 6044188782411, 36157478162593, 216300858973502, 1293952564919109 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 3 of A303102.
LINKS
FORMULA
Empirical: a(n) = 5*a(n-1) +9*a(n-2) -14*a(n-3) -28*a(n-4) -6*a(n-5) +32*a(n-6) +10*a(n-7) -2*a(n-8) +32*a(n-9) -32*a(n-11).
EXAMPLE
Some solutions for n=5
..0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..1..0. .0..1..1
..1..1..0. .1..1..0. .0..0..1. .0..1..1. .1..1..1. .0..0..1. .1..0..1
..1..1..0. .0..1..1. .1..1..0. .0..1..1. .1..0..0. .0..1..1. .0..1..0
..1..0..1. .0..0..1. .0..0..1. .0..0..1. .0..0..1. .1..1..0. .0..0..1
..0..0..0. .1..1..1. .1..1..1. .1..1..1. .1..1..0. .0..0..1. .0..1..1
CROSSREFS
Cf. A303102.
Sequence in context: A205609 A257925 A205433 * A128272 A180579 A081591
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 18 2018
STATUS
approved

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)