A222495 Number of nX3 0..3 arrays with exactly floor(nX3/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order

0, 4, 6, 95, 525, 7420, 40428, 636953, 3473192, 57944170, 307452564, 5382036893, 27808882969, 505897592674, 2555395714322, 47885314854974, 237764769206647, 4553475954110482, 22336733995345136, 434447462103135220

Offset

1,2

Comments

Column 3 of A222500

Links

R. H. Hardin, Table of n, a(n) for n = 1..206

Example

Some solutions for n=4
..0..1..2....0..1..1....0..1..0....0..0..1....0..1..2....0..1..0....0..0..0
..0..1..1....2..1..3....1..1..0....0..0..0....0..0..0....0..1..1....1..0..0
..1..1..1....1..1..1....1..1..1....2..0..0....0..0..0....1..1..1....0..0..0
..1..1..1....1..1..1....1..1..1....0..0..0....0..0..0....1..1..1....2..0..0

Crossrefs

Sequence in context: A375671 A012897 A013079 * A307101 A087934 A052684

Adjacent sequences: A222492 A222493 A222494 * A222496 A222497 A222498

Keyword

nonn

Author

R. H. Hardin Feb 23 2013

Status

approved