A301887 Number of 4Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.

8, 34, 95, 203, 510, 1754, 5463, 16452, 49611, 153498, 478314, 1488796, 4635051, 14448493, 45103531, 140813098, 439606342, 1372574192, 4286144428, 13385273545, 41801527070, 130545539541, 407696977117, 1273260715371, 3976480385362

Offset

1,1

Comments

Row 4 of A301884.

Links

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

Example

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

Crossrefs

Cf. A301884.

Sequence in context: A298174 A249743 A298140 * A208639 A240785 A066804

Adjacent sequences: A301884 A301885 A301886 * A301888 A301889 A301890

Keyword

nonn

Author

R. H. Hardin, Mar 28 2018

Status

approved