A222584 Number of nX4 0..2 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order

4, 18, 112, 1087, 11442, 128213, 1471412, 17068476, 198654710, 2328829654, 27335961632, 322535055233, 3807753230632, 45124599083917, 535113331694641, 6363369440619695, 75729209656948170, 903078623804307816

Offset

1,1

Comments

Column 4 of A222587

Links

R. H. Hardin, Table of n, a(n) for n = 1..83

Example

Some solutions for n=3
..0..1..1..1....0..0..0..0....0..1..1..1....0..0..0..0....0..0..0..1
..2..1..1..1....1..0..0..0....0..0..1..1....0..0..0..1....0..0..0..0
..0..1..1..1....0..2..0..0....0..1..1..1....0..0..0..1....0..0..0..0

Crossrefs

Sequence in context: A113356 A062805 A326093 * A294469 A308462 A053483

Adjacent sequences: A222581 A222582 A222583 * A222585 A222586 A222587

Keyword

nonn

Author

R. H. Hardin Feb 25 2013

Status

approved