A222901 Number of nX3 0..3 arrays with no more than floor(nX3/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order

1, 7, 45, 767, 4909, 119393, 759891, 20299463, 130579169, 3588643955, 23230932391, 647426033879, 4209052934053, 118324983126455, 771976078016995, 21829828686370139, 142850851773130033, 4056660324820606967

Offset

1,2

Comments

Column 3 of A222906

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A232789 A203201 A287064 * A347508 A175909 A034471

Adjacent sequences: A222898 A222899 A222900 * A222902 A222903 A222904

Keyword

nonn

Author

R. H. Hardin Mar 09 2013

Status

approved