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A298920
Number of n X 4 0..1 arrays with every element equal to 1, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
1
1, 8, 2, 3, 7, 6, 9, 20, 22, 35, 59, 90, 145, 240, 378, 611, 991, 1598, 2585, 4188, 6766, 10947, 17715, 28658, 46369, 75032, 121394, 196419, 317815, 514230, 832041, 1346276, 2178310, 3524579, 5702891, 9227466, 14930353, 24157824, 39088170
OFFSET
1,2
COMMENTS
Column 4 of A298924.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +a(n-2) +a(n-6) -a(n-7) -a(n-8).
EXAMPLE
Some solutions for n=5
..0..0..0..0. .0..1..0..1. .0..0..0..0. .0..0..0..0. .0..0..1..1
..0..0..0..0. .0..1..0..1. .0..0..0..0. .0..0..0..0. .0..0..1..1
..1..1..1..1. .1..1..0..0. .0..0..0..0. .0..0..0..0. .0..0..1..1
..1..1..1..1. .0..1..0..1. .1..1..1..1. .0..0..0..0. .0..0..1..1
..1..1..1..1. .0..1..0..1. .1..1..1..1. .0..0..0..0. .0..0..1..1
CROSSREFS
Cf. A298924.
Sequence in context: A160105 A167162 A307154 * A254268 A247684 A248304
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 29 2018
STATUS
approved