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A317454
Number of nX4 0..1 arrays with every element unequal to 1, 2, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
1
2, 10, 36, 72, 353, 1525, 5601, 20603, 93180, 376067, 1440298, 6219533, 25449350, 101546963, 425583385, 1746282597, 7098263711, 29371457881, 120619016253, 493714118241, 2033241533001, 8352126707843, 34269831877530, 140900257953996
OFFSET
1,1
COMMENTS
Column 4 of A317458.
FORMULA
Empirical recurrence of order 64 (see link above)
EXAMPLE
Some solutions for n=5
..0..0..1..0. .0..1..1..1. .0..0..1..0. .0..0..1..0. .0..1..1..0
..1..0..0..1. .1..0..1..0. .1..0..0..1. .1..0..0..1. .0..1..1..0
..0..0..0..0. .1..1..1..1. .0..0..0..0. .0..0..0..0. .1..1..1..1
..1..0..0..1. .1..0..1..0. .0..0..0..1. .1..0..0..0. .0..1..1..0
..1..0..0..0. .1..1..1..1. .0..1..0..0. .0..0..1..1. .1..1..1..0
CROSSREFS
Cf. A317458.
Sequence in context: A140954 A309889 A155894 * A244715 A212573 A100535
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 28 2018
STATUS
approved