A222909 Number of 4Xn 0..3 arrays with no more than floor(4Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order

15, 75, 767, 7794, 101398, 1346067, 21064292, 356150811, 6366063573, 115668702638, 2139261596454, 39572902785373, 737955955427551, 13730713590038976, 256798310856319397, 4793531311138014167

Offset

1,1

Comments

Row 4 of A222906

Links

R. H. Hardin, Table of n, a(n) for n = 1..31

Example

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

Crossrefs

Sequence in context: A260550 A051880 A007328 * A049391 A370739 A247264

Adjacent sequences: A222906 A222907 A222908 * A222910 A222911 A222912

Keyword

nonn

Author

R. H. Hardin Mar 09 2013

Status

approved