A301785 Number of n X n 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero.

1, 5, 12, 32, 82, 205, 508, 1258, 3129, 7837, 19782, 50310, 128803, 331592, 857434, 2224726, 5787130, 15082283, 39360630, 102820286, 268777679, 702935723, 1839002254, 4812250428, 12594535285, 32965703404, 86292668280, 225894991484

Offset: 1

Author

R. H. Hardin, Mar 26 2018

Keywords

• nonn

Comments

Diagonal of A301790.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..36

Crossrefs

Cf. A301790.