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A299557
Number of nX4 0..1 arrays with every element equal to 0, 2, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
1
1, 18, 15, 34, 77, 230, 734, 2261, 7050, 22143, 69461, 219276, 693784, 2194918, 6942360, 21968267, 69526220, 220063117, 696615382, 2205253721, 6981275736, 22101410710, 69970396941, 221520928868, 701324741453, 2220376409611
OFFSET
1,2
COMMENTS
Column 4 of A299561.
FORMULA
Empirical recurrence of order 72 (see link above)
EXAMPLE
Some solutions for n=9
..0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0
..0..0..0..0. .0..1..1..0. .0..0..0..0. .0..0..0..0. .0..0..0..0
..0..0..0..0. .0..1..0..1. .0..0..0..0. .1..1..1..1. .0..0..0..0
..1..1..1..1. .1..0..0..1. .1..1..1..1. .1..1..1..1. .1..1..1..1
..1..0..0..1. .1..1..1..1. .1..0..0..1. .0..0..0..0. .1..0..0..1
..1..0..1..0. .0..0..0..0. .0..1..0..1. .0..0..0..0. .0..1..0..1
..1..1..1..0. .0..0..0..0. .0..1..0..1. .0..0..0..0. .0..1..0..1
..1..0..0..1. .0..0..0..0. .0..1..0..1. .1..1..1..1. .1..0..0..1
..0..0..1..1. .0..0..0..0. .0..0..1..1. .1..1..1..1. .1..1..1..1
CROSSREFS
Cf. A299561.
Sequence in context: A159502 A077668 A298723 * A079293 A070646 A375676
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 12 2018
STATUS
approved