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A303957 Number of nX4 0..1 arrays with every element unequal to 0, 1, 2 or 5 king-move adjacent elements, with upper left element zero. 1
8, 9, 22, 61, 159, 452, 1228, 3334, 9109, 24981, 68361, 186938, 511360, 1399227, 3828333, 10473733, 28654819, 78397711, 214490589, 586827986, 1605511103, 4392547097, 12017651474, 32879305320, 89955066866, 246109662001 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A303961.
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +3*a(n-2) -3*a(n-3) +3*a(n-4) -2*a(n-5) -14*a(n-6) +6*a(n-7) +9*a(n-8) -5*a(n-9) +4*a(n-11) -2*a(n-13) for n>17
EXAMPLE
Some solutions for n=5
..0..0..1..0. .0..0..0..0. .0..1..0..0. .0..0..1..0. .0..0..1..1
..1..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..1..1
..0..0..0..0. .0..0..0..1. .0..0..0..1. .0..0..0..1. .1..1..1..1
..0..0..1..1. .0..0..0..0. .0..0..0..0. .0..0..0..0. .1..1..1..1
..0..0..1..1. .0..0..1..0. .0..1..0..0. .0..1..0..0. .1..0..1..1
CROSSREFS
Cf. A303961.
Sequence in context: A048124 A322637 A322640 * A046258 A074344 A256932
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 03 2018
STATUS
approved

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Last modified June 16 22:16 EDT 2024. Contains 373432 sequences. (Running on oeis4.)