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A302809 Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
4, 32, 169, 934, 5117, 28128, 154494, 848519, 4660562, 25597855, 140595667, 772217905, 4241385457, 23295695745, 127950975583, 702767266506, 3859930159709, 21200561758854, 116443510741144, 639562826045595 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 3 of A302808.
LINKS
FORMULA
Empirical: a(n) = 3*a(n-1) +14*a(n-2) +2*a(n-3) -22*a(n-4) +3*a(n-5) +37*a(n-6) -19*a(n-7) -4*a(n-8) +24*a(n-9) -4*a(n-10) +11*a(n-11) +8*a(n-12) +2*a(n-13) for n>15
EXAMPLE
Some solutions for n=5
..0..0..1..0..0. .0..1..0..1..0. .0..1..1..0..0. .0..0..0..1..1
..0..1..0..1..0. .1..1..1..0..0. .1..0..1..1..1. .0..0..1..0..0
..1..0..0..1..0. .0..0..1..0..1. .0..1..0..0..0. .1..1..1..1..1
CROSSREFS
Cf. A302808.
Sequence in context: A270076 A271149 A271201 * A303470 A222507 A270153
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 13 2018
STATUS
approved

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Last modified June 14 09:23 EDT 2024. Contains 373393 sequences. (Running on oeis4.)