A286975 Number of n X 4 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 two less than the number of 0's adjacent to some 1.

0, 30, 538, 8270, 123706, 1853532, 27938670, 424161696, 6473516290, 99212813068, 1525788269640, 23533226594814, 363874149524074, 5638501690692214, 87539755014915366, 1361389260565705844, 21203931694258697402

Offset

1,2

Comments

Column 4 of A286979.

Links

R. H. Hardin, Table of n, a(n) for n = 1..174

Example

Some solutions for n=4
..0..1..1..1. .0..0..1..0. .1..1..0..0. .1..0..0..0. .0..1..0..1
..0..0..0..1. .1..0..1..0. .0..0..1..0. .1..0..1..0. .0..0..0..1
..1..0..0..1. .1..0..0..0. .1..1..0..1. .0..1..0..1. .1..0..0..0
..0..0..1..1. .1..1..1..0. .0..0..0..0. .1..0..0..0. .0..1..1..1

Crossrefs

Cf. A286979.

Sequence in context: A050982 A004327 A270499 * A139626 A037961 A143399

Adjacent sequences: A286972 A286973 A286974 * A286976 A286977 A286978

Keyword

nonn

Author

R. H. Hardin, May 17 2017

Status

approved