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A306132
Number of nX4 0..1 arrays with every element unequal to 0, 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.
2
1, 24, 64, 498, 2922, 16877, 111073, 700859, 4405884, 28199822, 179362001, 1140613869, 7270251022, 46301421256, 294878401359, 1878528663477, 11965892345235, 76220990690570, 485534190519239, 3092850581186659
OFFSET
1,2
COMMENTS
Column 4 of A306136.
FORMULA
Empirical recurrence of order 71 (see link above)
EXAMPLE
Some solutions for n=5
..0..0..1..0. .0..1..0..1. .0..0..1..0. .0..1..0..1. .0..0..1..0
..1..1..0..1. .0..1..0..1. .1..1..1..0. .1..0..0..0. .1..1..0..1
..0..0..0..1. .0..0..0..0. .0..0..1..1. .1..1..0..1. .1..0..1..0
..0..0..1..0. .0..1..0..1. .1..1..0..0. .1..0..1..0. .0..1..1..0
..0..0..1..0. .0..1..0..1. .0..0..0..1. .0..1..1..0. .0..1..0..1
CROSSREFS
Cf. A306136.
Sequence in context: A022761 A090386 A239596 * A118609 A127878 A205823
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 22 2018
STATUS
approved