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A302382 Number of 3Xn 0..1 arrays with every element equal to 1, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
0, 11, 76, 430, 2886, 19215, 127535, 847604, 5631313, 37416247, 248600404, 1651756796, 10974620983, 72917744789, 484481101148, 3218996316583, 21387701319096, 142104471542165, 944172564092345, 6273284870138765 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Row 3 of A302381.
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) +15*a(n-2) +14*a(n-3) +19*a(n-4) +8*a(n-5) +9*a(n-6) -9*a(n-7) +4*a(n-8) -5*a(n-9) +3*a(n-10) -3*a(n-11) -5*a(n-12) +a(n-13) -2*a(n-14) for n>15
EXAMPLE
Some solutions for n=5
..0..1..1..0..1. .0..1..1..0..1. .0..0..0..1..0. .0..1..1..0..0
..0..0..1..1..0. .0..0..1..1..0. .0..1..1..0..1. .1..0..0..1..0
..0..0..1..0..0. .1..1..0..0..0. .0..0..0..1..1. .1..1..0..0..0
CROSSREFS
Cf. A302381.
Sequence in context: A055901 A036427 A122589 * A034269 A256597 A245561
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 06 2018
STATUS
approved

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Last modified September 24 19:02 EDT 2023. Contains 365581 sequences. (Running on oeis4.)