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.

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

R. H. Hardin, Table of n, a(n) for n = 1..155

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

Adjacent sequences: A301887 A301888 A301889 * A301891 A301892 A301893

Keyword

nonn

Author

R. H. Hardin, Mar 28 2018

Status

approved