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A301783
Number of nX7 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.
1
64, 8192, 772272, 75632400, 7381982784, 720677122368, 70356843337600, 6868652110439488, 670558705424435264, 65463930429261156928, 6390978398666846999104, 623925337422198984802880
OFFSET
1,1
COMMENTS
Column 7 of A301784.
FORMULA
Empirical recurrence of order 46 (see link above)
EXAMPLE
Some solutions for n=5
..0..0..0..0..0..0..0. .0..0..0..0..0..1..0. .0..0..0..0..0..0..1
..0..0..1..0..1..1..1. .0..0..1..0..1..0..1. .0..0..1..0..0..1..0
..0..0..1..0..1..0..1. .0..0..1..0..0..1..0. .0..0..1..0..1..1..0
..0..0..1..1..1..0..1. .0..0..1..0..1..0..0. .0..0..1..0..1..0..0
..0..0..0..1..0..0..1. .0..0..0..1..0..0..1. .0..0..0..1..0..0..1
CROSSREFS
Cf. A301784.
Sequence in context: A301442 A302014 A302009 * A213417 A316807 A317524
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 26 2018
STATUS
approved