A284223 Number of 2 X n 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

2, 6, 13, 44, 143, 495, 1746, 6399, 23776, 89321, 337909, 1285710, 4914573, 18861581, 72633154, 280492954, 1085801918, 4211904917, 16367963509, 63710308355, 248341387058, 969279971828, 3787525164193, 14815659532381, 58010290470976

Offset: 1

Author

R. H. Hardin, Mar 23 2017

Keywords

• nonn

Comments

Row 2 of A284222.

Examples

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

Links

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

Crossrefs

Cf. A284222.