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A316126
Number of nX4 0..1 arrays with every element unequal to 1, 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
1
2, 45, 197, 1112, 6562, 36480, 204465, 1170851, 6622412, 37527145, 213051804, 1207987372, 6850738403, 38858760572, 220384969476, 1249936673191, 7089251093164, 40207467076807, 228041955210057, 1293371442017860
OFFSET
1,1
COMMENTS
Column 4 of A316130.
FORMULA
Empirical recurrence of order 67 (see link above)
EXAMPLE
Some solutions for n=5
..0..1..0..0. .0..0..0..1. .0..0..0..0. .0..1..1..0. .0..1..1..1
..1..1..0..1. .0..1..0..1. .1..0..1..1. .0..1..1..0. .1..0..1..0
..1..1..1..1. .0..1..1..0. .0..0..1..1. .0..0..0..0. .1..0..0..0
..0..1..1..1. .0..1..0..1. .1..1..0..1. .0..0..1..0. .1..0..1..0
..1..1..0..1. .0..0..0..1. .0..1..0..0. .0..1..1..0. .1..1..1..1
CROSSREFS
Cf. A316130.
Sequence in context: A304693 A200158 A316444 * A317432 A302468 A303250
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 24 2018
STATUS
approved