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A301610 Number of nX3 0..1 arrays with every element equal to 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero. 1
1, 11, 62, 367, 2131, 12467, 72758, 425003, 2481842, 14494425, 84647239, 494344466, 2886987133, 16860117364, 98463698698, 575031667957, 3358206190785, 19612048586036, 114535089777733, 668889165654501, 3906337494564368 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 3 of A301615.
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) +12*a(n-2) -5*a(n-3) -14*a(n-4) +14*a(n-6) +4*a(n-7) -3*a(n-8) -5*a(n-9) +a(n-10)
EXAMPLE
Some solutions for n=5
..0..0..1. .0..1..0. .0..1..0. .0..1..1. .0..0..0. .0..1..1. .0..0..0
..1..1..1. .0..1..0. .0..1..0. .0..1..0. .1..0..0. .0..0..1. .0..1..1
..1..0..1. .1..1..0. .0..0..0. .1..0..0. .1..1..1. .1..0..1. .0..0..1
..1..0..1. .1..0..0. .1..1..0. .1..0..1. .0..1..1. .1..0..1. .1..1..0
..1..0..1. .1..1..1. .1..1..0. .1..0..1. .0..0..1. .0..0..0. .1..1..0
CROSSREFS
Cf. A301615.
Sequence in context: A227087 A052051 A162946 * A298046 A120723 A053367
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 24 2018
STATUS
approved

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Last modified February 24 17:27 EST 2024. Contains 370307 sequences. (Running on oeis4.)