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A304304
Number of nX2 0..1 arrays with every element unequal to 0, 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero.
8
2, 8, 23, 65, 192, 569, 1709, 5162, 15663, 47669, 145352, 443789, 1356105, 4146218, 12681419, 38795969, 118706016, 363247697, 1111633973, 3402041162, 10411891095, 31866011357, 97528388600, 298495524005, 913580540913, 2796129772298
OFFSET
1,1
COMMENTS
Column 2 of A304310.
LINKS
FORMULA
Empirical: a(n) = 3*a(n-1) +3*a(n-2) -6*a(n-3) -8*a(n-4) for n>5
EXAMPLE
Some solutions for n=5
..0..0. .0..1. .0..0. .0..0. .0..1. .0..0. .0..0. .0..0. .0..1. .0..0
..1..0. .0..1. .0..0. .0..0. .1..0. .1..0. .1..1. .1..0. .0..0. .1..0
..1..1. .0..1. .0..1. .0..0. .1..0. .0..0. .1..1. .1..1. .0..1. .1..1
..1..0. .0..1. .1..1. .1..1. .1..0. .1..1. .0..1. .1..1. .0..0. .0..1
..1..1. .0..1. .0..0. .0..1. .1..0. .0..1. .1..1. .0..0. .0..0. .0..0
CROSSREFS
Cf. A304310.
Sequence in context: A294959 A290926 A018042 * A072842 A303861 A138387
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 10 2018
STATUS
approved