A221634 Equals one maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 3Xn array

1, 38, 395, 3848, 32149, 261182, 2095293, 16774816, 134213444, 1073737004, 8589926161, 68719468238, 549755798961, 4398046497376, 35184372064343, 281474976689834, 2251799813647324, 18014398509451874, 144115188075799743

Offset

1,2

Comments

Row 3 of A221632

Links

R. H. Hardin, Table of n, a(n) for n = 1..76

Example

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

Crossrefs

Sequence in context: A187078 A155193 A159943 * A251056 A267474 A240258

Adjacent sequences: A221631 A221632 A221633 * A221635 A221636 A221637

Keyword

nonn

Author

R. H. Hardin Jan 21 2013

Status

approved