A222881 Number of 4Xn 0..3 arrays with no more than floor(4Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order

15, 2150, 443510, 95867967, 20978414941, 4643150795564, 1036481888251762, 232912437941917635, 52614561200004212957, 11936312777288007185980, 2717468404561524996790251, 620503805193057253513443782

Offset

1,1

Comments

Row 4 of A222878

Links

R. H. Hardin, Table of n, a(n) for n = 1..16

Example

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

Crossrefs

Sequence in context: A126681 A263162 A232196 * A229844 A208171 A266571

Adjacent sequences: A222878 A222879 A222880 * A222882 A222883 A222884

Keyword

nonn

Author

R. H. Hardin Mar 08 2013

Status

approved