A222825 Number of nX2 0..3 arrays with no more than floor(nX2/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order

1, 8, 80, 1154, 14388, 200082, 2652496, 36622104, 498427856, 6893943128, 95040804864, 1319624517920, 18325966197056, 255430185200544, 3564132957005568, 49841772120587648, 697848234833263872

Offset

1,2

Comments

Column 2 of A222828

Links

R. H. Hardin, Table of n, a(n) for n = 1..209

Example

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

Crossrefs

Sequence in context: A060375 A097815 A002718 * A057707 A222671 A271443

Adjacent sequences: A222822 A222823 A222824 * A222826 A222827 A222828

Keyword

nonn

Author

R. H. Hardin Mar 06 2013

Status

approved