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

1,1

Comments

Row 2 of A222906.

Links

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

Example

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

Crossrefs

Cf. A222906.

Sequence in context: A103001 A343798 A222987 * A179386 A343977 A065846

Adjacent sequences: A222904 A222905 A222906 * A222908 A222909 A222910

Keyword

nonn

Author

R. H. Hardin, Mar 09 2013

Status

approved