A284335 Number of 2 X n 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

2, 4, 13, 34, 118, 419, 1481, 5394, 19848, 73880, 277222, 1047495, 3977615, 15169751, 58074521, 223081286, 859450114, 3319751314, 12852496680, 49860496892, 193783946748, 754379484650, 2941051327294, 11481400024511, 44875877924939

Offset: 1

Author

R. H. Hardin, Mar 25 2017

Keywords

• nonn

Comments

Row 2 of A284334.

Examples

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

Links

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

Crossrefs

Cf. A284334.