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A299368
Number of nX3 0..1 arrays with every element equal to 1, 2, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.
1
1, 18, 130, 876, 6025, 41528, 285931, 1968966, 13558267, 93362733, 642898196, 4427015757, 30484557038, 209917536834, 1445498190622, 9953742093052, 68541754163759, 471980489384723, 3250071216793220, 22380083820956744
OFFSET
1,2
COMMENTS
Column 3 of A299373.
LINKS
FORMULA
Empirical: a(n) = 7*a(n-1) +2*a(n-2) -19*a(n-3) -a(n-4) -2*a(n-5) +4*a(n-6) -2*a(n-7) -3*a(n-8) -5*a(n-9) +2*a(n-10) for n>11
EXAMPLE
Some solutions for n=5
..0..0..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. .1..1..1. .1..1..1. .0..0..0. .0..0..0. .0..0..0
..0..0..0. .0..0..0. .1..1..1. .1..1..1. .1..1..1. .0..0..0. .1..1..1
..0..0..0. .1..1..1. .1..1..1. .1..1..1. .1..1..1. .1..1..1. .1..1..1
..0..0..0. .1..1..1. .1..1..1. .0..0..0. .1..1..1. .1..0..0. .1..1..1
CROSSREFS
Cf. A299373.
Sequence in context: A142965 A298275 A299137 * A299932 A058649 A273222
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 08 2018
STATUS
approved