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A304132
Number of nX7 0..1 arrays with every element unequal to 0, 1, 3 or 6 king-move adjacent elements, with upper left element zero.
1
21, 103, 89, 244, 582, 1321, 2945, 6333, 13315, 28932, 63006, 134021, 284831, 607277, 1291893, 2755806, 5876374, 12482965, 26539285, 56520687, 120314557, 256086726, 545101754, 1160070321, 2469739659, 5259410891, 11198740071, 23845751230
OFFSET
1,1
COMMENTS
Column 7 of A304133.
FORMULA
Empirical recurrence of order 79 (see link above)
EXAMPLE
Some solutions for n=5
..0..0..1..1..1..0..0. .0..0..1..1..1..1..1. .0..0..1..1..0..0..0
..0..1..1..1..1..1..0. .0..1..1..1..1..1..0. .0..1..1..1..1..0..0
..1..1..1..1..0..0..0. .0..0..0..1..1..0..0. .1..1..1..1..1..1..0
..0..0..1..1..1..0..0. .0..0..1..1..1..1..1. .1..1..1..1..0..0..0
..0..1..1..1..1..1..0. .0..1..1..1..1..1..0. .1..1..1..1..1..0..0
CROSSREFS
Cf. A304133.
Sequence in context: A076454 A208538 A303681 * A304220 A305481 A219385
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 07 2018
STATUS
approved