A219436 Unmatched value maps: number of nX3 binary arrays indicating the locations of corresponding elements not equal to any horizontal, diagonal or antidiagonal neighbor in a random 0..1 nX3 array

4, 18, 78, 329, 1396, 5925, 25147, 106731, 452984, 1922547, 8159665, 34631193, 146981443, 623817540, 2647601755, 11236931619, 47691701338, 202412762994, 859078738551, 3646095572825, 15474731627673, 65677740521441

Offset

1,1

Comments

Column 3 of A219441

Links

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

Formula

Empirical: a(n) = 4*a(n-1) +a(n-2) +a(n-3) -2*a(n-4) -6*a(n-5) -3*a(n-6) -2*a(n-7) +5*a(n-8) +4*a(n-9) -2*a(n-10) -2*a(n-11)

Example

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

Crossrefs

Sequence in context: A017959 A100069 A058870 * A219137 A240342 A208309

Adjacent sequences: A219433 A219434 A219435 * A219437 A219438 A219439

Keyword

nonn

Author

R. H. Hardin Nov 20 2012

Status

approved