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A301883
Number of nX7 0..1 arrays with every element equal to 0, 1 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.
1
21, 154, 823, 5463, 33853, 223869, 1454613, 9620565, 63336647, 419113710, 2770472419, 18336620495, 121358670826, 803332031961, 5318434541385, 35208666237989, 233111781026276, 1543314708909090, 10218090869079319
OFFSET
1,1
COMMENTS
Column 7 of A301884.
FORMULA
Empirical recurrence of order 52 (see link above)
EXAMPLE
Some solutions for n=5
..0..1..0..1..0..0..0. .0..1..0..1..0..1..1. .0..0..0..1..0..0..0
..0..1..0..1..0..1..0. .0..1..0..1..0..0..0. .0..1..1..1..0..1..1
..0..0..0..1..0..1..0. .0..1..0..1..0..1..0. .0..0..0..1..0..0..0
..1..1..1..1..0..1..1. .0..0..0..1..0..1..0. .0..1..0..1..0..1..0
..1..0..0..1..0..0..1. .1..1..0..0..0..1..0. .0..1..0..1..0..1..1
CROSSREFS
Cf. A301884.
Sequence in context: A184376 A184368 A078396 * A302080 A331528 A180374
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 28 2018
STATUS
approved