A222693 Number of 4Xn 0..2 arrays with exactly floor(4Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

0, 50, 420, 3189, 29770, 288829, 3056797, 33647294, 383305129, 4415390639, 51510198510, 603131077948, 7102730170463, 83812987023962, 992203100748874, 11765035615799023, 139801821712063400, 1663617025712371825

Offset

1,2

Comments

Row 4 of A222690

Links

R. H. Hardin, Table of n, a(n) for n = 1..52

Example

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

Crossrefs

Sequence in context: A280548 A293608 A111341 * A228743 A019561 A164757

Adjacent sequences: A222690 A222691 A222692 * A222694 A222695 A222696

Keyword

nonn

Author

R. H. Hardin Feb 28 2013

Status

approved