A222661 Number of nX3 0..3 arrays with exactly floor(nX3/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order

0, 2, 2, 44, 110, 2686, 7624, 186400, 568750, 13426930, 43148672, 976797964, 3288287090, 71553941138, 250795793620, 5271389823322, 19133542669712, 390312748312702, 1460010782595862, 29031771420777158, 111430693524389896

Offset

1,2

Comments

Column 3 of A222666

Links

R. H. Hardin, Table of n, a(n) for n = 1..201

Example

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

Crossrefs

Sequence in context: A349602 A156467 A303538 * A015167 A086204 A318085

Adjacent sequences: A222658 A222659 A222660 * A222662 A222663 A222664

Keyword

nonn

Author

R. H. Hardin Feb 28 2013

Status

approved