A222907 Number of 2 X n 0..3 arrays with no more than floor(2 X n/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

2, 4, 7, 25, 92, 403, 1710, 8021, 36160, 175685, 811796, 3996105, 18729552, 92602363, 438528764, 2169839823, 10361611742, 51246105785, 246397237188, 1217744328605, 5887982752143, 29081428391143, 141255777787573, 697390129303759

Offset: 1

Author

R. H. Hardin, Mar 09 2013

Keywords

• nonn

Comments

Row 2 of A222906.

Examples

			All solutions for n=3
..0..1..1....0..0..1....0..0..1....0..0..0....0..0..0....0..0..0....0..0..0
..1..1..1....0..0..0....1..1..1....0..0..1....0..0..0....1..0..0....0..1..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..138

Crossrefs

Cf. A222906.