A223050 Number of nX4 0..3 arrays with exactly floor(nX4/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order

6, 508, 95648, 17704612, 3345698159, 642902149269, 125023235986060, 24532345137855558, 4847658520889741087, 963306978592566283718, 192306743440029495693971, 38537949083984617104985257

Offset

1,1

Comments

Column 4 of A223052

Links

R. H. Hardin, Table of n, a(n) for n = 1..23

Example

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

Crossrefs

Sequence in context: A013975 A272094 A103520 * A290937 A364482 A365926

Adjacent sequences: A223047 A223048 A223049 * A223051 A223052 A223053

Keyword

nonn

Author

R. H. Hardin Mar 13 2013

Status

approved