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A297910
Number of nX3 0..1 arrays with every element equal to 0, 2, 3 or 4 king-move adjacent elements, with upper left element zero.
1
1, 12, 10, 49, 144, 481, 2016, 7730, 30637, 122459, 486274, 1937553, 7719764, 30746715, 122495655, 487999537, 1944079833, 7744935218, 30854501570, 122919184440, 489690085219, 1950844654280, 7771845245990, 30961758474839
OFFSET
1,2
COMMENTS
Column 3 of A297915.
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) +a(n-2) -17*a(n-4) -2*a(n-6) +3*a(n-7) +53*a(n-8) -11*a(n-9) -60*a(n-10) +14*a(n-11) +20*a(n-12) -4*a(n-13) for n>15
EXAMPLE
Some solutions for n=7
..0..0..0. .0..1..0. .0..1..0. .0..0..0. .0..0..1. .0..1..1. .0..0..1
..0..1..0. .1..1..1. .1..1..1. .0..1..0. .0..1..1. .0..0..1. .1..0..0
..0..1..1. .1..0..0. .0..0..0. .1..1..0. .0..0..1. .0..1..1. .1..1..1
..0..0..1. .0..1..0. .0..1..0. .1..0..1. .1..0..0. .1..0..1. .0..0..1
..0..1..1. .0..1..1. .0..1..1. .0..1..0. .1..1..0. .1..0..0. .0..1..1
..0..1..1. .0..1..1. .1..0..0. .1..0..1. .0..0..0. .1..0..0. .0..0..0
..0..0..1. .0..0..1. .1..1..0. .1..1..1. .1..0..1. .1..1..0. .1..0..1
CROSSREFS
Cf. A297915.
Sequence in context: A262965 A094450 A307166 * A298503 A038336 A236506
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 08 2018
STATUS
approved