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A316444
Number of nX4 0..1 arrays with every element unequal to 1, 2, 3, 5, 6 or 8 king-move adjacent elements, with upper left element zero.
1
2, 45, 182, 946, 5256, 26592, 139705, 743357, 3895564, 20551990, 108462086, 571420486, 3013738375, 15893704443, 83803905400, 441952817246, 2330642013397, 12290475240990, 64814511670451, 341801050087962, 1802496248933719
OFFSET
1,1
COMMENTS
Column 4 of A316448.
FORMULA
Empirical recurrence of order 69 (see link above)
EXAMPLE
Some solutions for n=5
..0..1..0..0. .0..0..0..1. .0..1..0..0. .0..1..1..0. .0..1..0..0
..1..0..1..1. .0..1..0..1. .0..0..0..1. .1..1..1..1. .0..1..1..0
..1..0..1..0. .1..0..1..1. .0..0..0..0. .1..1..1..1. .0..1..0..0
..1..0..0..0. .1..1..0..1. .1..1..0..1. .0..0..1..0. .0..1..0..1
..1..0..1..0. .0..1..1..0. .1..0..0..0. .1..0..1..1. .0..1..1..1
CROSSREFS
Cf. A316448.
Sequence in context: A302666 A304693 A200158 * A316126 A317432 A302468
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 03 2018
STATUS
approved