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A301890
Number of 7Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.
1
64, 610, 2841, 7883, 31173, 240222, 1454613, 7734317, 39492565, 231010966, 1368292090, 7943126611, 45394661195, 264505253778, 1552587576944, 9114661439887, 53464193088001, 314087978745270, 1846947051770084
OFFSET
1,1
COMMENTS
Row 7 of A301884.
LINKS
EXAMPLE
Some solutions for n=5
..0..1..0..1..0. .0..1..0..1..0. .0..0..1..0..1. .0..0..1..0..1
..0..1..0..1..0. .0..1..1..0..0. .1..1..1..1..1. .1..1..1..0..1
..0..0..0..1..0. .0..1..0..1..0. .0..1..0..0..0. .0..0..1..0..1
..1..1..0..0..1. .0..1..0..1..0. .0..1..0..1..0. .1..1..1..0..1
..0..1..0..0..1. .0..1..1..1..0. .0..1..0..1..0. .0..0..1..0..1
..0..0..1..0..1. .0..0..0..1..0. .1..0..1..0..1. .1..1..1..1..1
..0..1..0..1..0. .0..1..1..1..0. .1..0..1..0..0. .0..1..0..0..1
CROSSREFS
Cf. A301884.
Sequence in context: A301796 A301969 A208642 * A302086 A229401 A232052
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 28 2018
STATUS
approved