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A297918
Number of nX3 0..1 arrays with every element equal to 1, 2, 3 or 4 king-move adjacent elements, with upper left element zero.
1
1, 17, 109, 588, 3276, 18451, 103558, 581318, 3263838, 18323588, 102871721, 577541657, 3242423256, 18203555673, 102198092227, 573758755891, 3221186481709, 18084329459118, 101528729659838, 570000838170243
OFFSET
1,2
COMMENTS
Column 3 of A297923.
LINKS
FORMULA
Empirical: a(n) = 5*a(n-1) +3*a(n-2) +6*a(n-3) -17*a(n-4) -12*a(n-5) -7*a(n-6) -36*a(n-7) +6*a(n-8) -19*a(n-9) for n>12
EXAMPLE
Some solutions for n=7
..0..0..1. .0..1..1. .0..1..1. .0..0..0. .0..1..1. .0..0..1. .0..0..1
..0..1..0. .1..0..0. .1..0..0. .1..1..1. .1..0..1. .0..0..1. .1..1..1
..0..0..1. .1..1..0. .1..1..0. .1..0..0. .0..1..0. .1..1..0. .1..0..0
..1..0..1. .0..0..1. .0..0..1. .1..1..0. .0..1..1. .0..1..1. .0..0..1
..1..1..0. .0..1..0. .0..1..1. .1..0..1. .1..0..1. .1..0..0. .0..1..1
..0..0..1. .1..1..0. .1..0..1. .0..0..1. .0..0..1. .0..1..0. .1..0..1
..0..1..0. .1..0..0. .0..0..1. .0..1..1. .0..0..1. .1..0..1. .0..1..1
CROSSREFS
Cf. A297923.
Sequence in context: A354183 A141921 A013308 * A298542 A261809 A264723
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 08 2018
STATUS
approved