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A316451
Number of nX4 0..1 arrays with every element unequal to 1, 2, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.
1
2, 10, 23, 48, 229, 850, 3223, 10880, 45692, 175031, 633752, 2571686, 9904681, 37484676, 148315504, 573843418, 2209226947, 8646079404, 33532139222, 129892215361, 506136051248, 1965179506521, 7628724478673, 29676160150437
OFFSET
1,1
COMMENTS
Column 4 of A316455.
FORMULA
Empirical recurrence of order 67 (see link above)
EXAMPLE
Some solutions for n=5
..0..1..1..0. .0..1..1..1. .0..1..0..0. .0..0..0..0. .0..0..1..1
..0..1..1..0. .0..1..1..0. .1..0..0..1. .1..0..0..1. .1..1..1..0
..1..1..1..1. .1..1..1..1. .0..0..0..0. .0..0..0..0. .0..0..0..1
..0..1..1..0. .0..1..1..0. .1..0..0..0. .0..0..0..1. .0..0..1..1
..1..1..0..1. .1..1..1..1. .0..0..1..0. .0..1..0..0. .0..1..0..1
CROSSREFS
Cf. A316455.
Sequence in context: A372846 A255606 A293403 * A120845 A373276 A330280
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 03 2018
STATUS
approved