A221668 Sum of neighbor maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to the sum mod 3 of their horizontal, diagonal and antidiagonal neighbors in a random 0..2 3Xn array

8, 48, 512, 3772, 31744, 262144, 2097152, 16728064, 134140928, 1073741824, 8587837440, 68719476736, 549755813888, 4397939335680, 35184372088832, 281474976710656, 2251796592459776, 18014398509481984, 144115185909972992

Offset

1,1

Comments

Row 3 of A221666

Links

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

Example

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

Crossrefs

Sequence in context: A220174 A239888 A072169 * A222382 A220802 A052575

Adjacent sequences: A221665 A221666 A221667 * A221669 A221670 A221671

Keyword

nonn

Author

R. H. Hardin Jan 21 2013

Status

approved