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A302001
Number of 4Xn 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.
1
0, 13, 15, 74, 468, 2036, 10982, 53440, 271596, 1360466, 6832459, 34345485, 172485648, 866676017, 4353899691, 21873626234, 109891360736, 552080909728, 2773601514082, 13934283247296, 70004406947220, 351694969884786
OFFSET
1,2
COMMENTS
Row 4 of A301999.
LINKS
EXAMPLE
Some solutions for n=5
..0..0..1..1..0. .0..0..1..1..0. .0..0..1..1..0. .0..0..1..1..0
..0..0..0..0..0. .1..1..1..0..0. .0..0..1..0..1. .0..0..1..0..0
..1..1..0..1..1. .1..0..1..1..1. .0..1..0..1..0. .0..1..1..0..1
..1..1..1..0..0. .0..1..0..0..0. .1..0..1..0..0. .0..0..0..1..1
CROSSREFS
Cf. A301999.
Sequence in context: A217252 A299593 A318543 * A109018 A237912 A268664
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 30 2018
STATUS
approved