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A298542
Number of nX3 0..1 arrays with every element equal to 1, 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero.
1
1, 17, 109, 588, 3276, 18500, 104034, 585134, 3291766, 18516878, 104162234, 585942186, 3296084046, 18541374458, 104300314322, 586717825798, 3300448449034, 18565926430146, 104438420710534, 587494718619882
OFFSET
1,2
COMMENTS
Column 3 of A298547.
LINKS
FORMULA
Empirical: a(n) = 5*a(n-1) +3*a(n-2) +6*a(n-3) -15*a(n-4) -11*a(n-5) -5*a(n-6) -46*a(n-7) -2*a(n-8) -38*a(n-9) -16*a(n-10) -8*a(n-11) -8*a(n-12) for n>13
EXAMPLE
Some solutions for n=7
..0..0..1. .0..0..1. .0..0..1. .0..0..0. .0..0..1. .0..1..1. .0..1..1
..0..1..0. .0..1..0. .0..0..1. .1..0..1. .0..1..0. .0..1..0. .1..0..0
..1..0..1. .0..0..0. .1..0..1. .1..1..1. .0..0..0. .0..0..0. .1..0..1
..1..1..1. .0..0..0. .1..1..1. .1..1..1. .0..0..0. .0..0..0. .1..1..1
..1..1..1. .0..1..0. .1..1..1. .1..0..1. .0..1..0. .0..1..0. .1..1..1
..1..0..1. .1..0..0. .1..0..1. .1..0..1. .0..1..1. .1..1..0. .1..0..1
..0..1..0. .0..1..1. .1..0..1. .0..1..0. .0..1..1. .1..0..1. .1..1..0
CROSSREFS
Cf. A298547.
Sequence in context: A141921 A013308 A297918 * A261809 A264723 A157099
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 21 2018
STATUS
approved