A222270 Number of nX2 0..3 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order

0, 0, 4, 13, 40, 162, 888, 3617, 18136, 81560, 407644, 1901375, 9349056, 44712494, 218395880, 1057844425, 5154076928, 25146813236, 122532346416, 600293886818, 2928771248408, 14383619678744, 70298507431888, 345790800489643

Offset

1,3

Comments

Column 2 of A222275

Links

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

Example

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

Crossrefs

Sequence in context: A034742 A149424 A097112 * A351892 A213496 A220926

Adjacent sequences: A222267 A222268 A222269 * A222271 A222272 A222273

Keyword

nonn

Author

R. H. Hardin Feb 14 2013

Status

approved