A301908 Number of 4Xn 0..1 arrays with every element equal to 0, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.

8, 1, 7, 5, 8, 40, 96, 316, 1078, 3831, 13331, 46127, 161362, 564617, 1975369, 6914911, 24216868, 84826850, 297130258, 1040826424, 3646117344, 12772898193, 44745724111, 156753135377, 549139791596, 1923758528089, 6739359943131

Offset

1,1

Comments

Row 4 of A301906.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=5
..0..1..1..0..0. .0..1..1..0..0. .0..1..1..0..0. .0..1..1..0..0
..1..1..0..0..1. .1..1..0..0..0. .1..1..0..0..0. .1..1..0..0..1
..1..1..1..0..0. .0..1..1..0..0. .1..1..1..0..0. .0..1..1..0..0
..1..1..0..0..1. .1..1..0..0..1. .1..1..0..0..1. .1..1..0..0..1

Crossrefs

Cf. A301906.

Sequence in context: A195489 A245280 A200585 * A200277 A242024 A159642

Adjacent sequences: A301905 A301906 A301907 * A301909 A301910 A301911

Keyword

nonn

Author

R. H. Hardin, Mar 28 2018

Status

approved