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A317149
Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
1
8, 28, 102, 416, 2313, 10682, 49746, 244887, 1177228, 5627176, 27191679, 131066702, 630509899, 3039081334, 14646383331, 70553902114, 339981134313, 1638328386371, 7894211192665, 38039938958253, 183306173610271, 883299222702849
OFFSET
1,1
COMMENTS
Column 4 of A317153.
FORMULA
Empirical recurrence of order 69 (see link above)
EXAMPLE
Some solutions for n=5
..0..1..0..0. .0..0..0..0. .0..0..0..0. .0..0..1..1. .0..0..0..0
..1..0..0..0. .0..0..0..0. .0..0..0..1. .1..1..1..0. .0..0..0..0
..0..0..0..1. .0..0..0..1. .0..0..1..0. .1..1..1..1. .0..1..1..0
..1..0..0..1. .1..0..0..1. .0..0..0..0. .0..1..1..1. .0..0..0..0
..1..0..0..0. .0..0..0..0. .0..0..1..0. .1..1..0..0. .0..1..1..0
CROSSREFS
Cf. A317153.
Sequence in context: A305907 A110687 A153365 * A316879 A220710 A260935
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 22 2018
STATUS
approved