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.

0, 13, 15, 74, 468, 2036, 10982, 53440, 271596, 1360466, 6832459, 34345485, 172485648, 866676017, 4353899691, 21873626234, 109891360736, 552080909728, 2773601514082, 13934283247296, 70004406947220, 351694969884786

Offset: 1

Author

R. H. Hardin, Mar 30 2018

Keywords

• nonn

Comments

Row 4 of A301999.

Examples

			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
		

Links

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

Crossrefs

Cf. A301999.