A222691 Number of 2Xn 0..2 arrays with exactly floor(2Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

0, 3, 4, 18, 56, 237, 784, 3218, 11152, 45290, 161696, 650010, 2372368, 9467136, 35149184, 139387576, 524385184, 2070069588, 7866603584, 30953957824, 118536117440, 465439834288, 1792785588096, 7030514425512, 27200880331136

Offset

1,2

Comments

Row 2 of A222690

Links

R. H. Hardin, Table of n, a(n) for n = 1..88

Example

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

Crossrefs

Sequence in context: A290956 A089427 A197564 * A254201 A222795 A318419

Adjacent sequences: A222688 A222689 A222690 * A222692 A222693 A222694

Keyword

nonn

Author

R. H. Hardin Feb 28 2013

Status

approved