A262422 Number of (3+1) X (n+1) 0..1 arrays with each row divisible by 3 and column not divisible by 3, read as a binary number with top and left being the most significant bits.

10, 12, 270, 1260, 15310, 124572, 1299070, 12380940, 124921710, 1235566332, 12379963870, 123483616620, 1235387708110, 12346379507292, 123476688644670, 1234585890852300, 12346166930494510, 123457247499499452

Offset

1,1

Comments

Row 3 of A262420.

Links

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

Formula

Empirical: a(n) = 10*a(n-1) +46*a(n-2) -460*a(n-3) -609*a(n-4) +6090*a(n-5) +2164*a(n-6) -21640*a(n-7) -1600*a(n-8) +16000*a(n-9).

Example

Some solutions for n=4
..1..1..0..1..1....0..1..1..1..1....0..0..0..1..1....0..0..1..1..0
..0..0..1..1..0....1..1..1..1..0....1..1..0..1..1....0..1..0..0..1
..0..1..1..1..1....1..1..0..1..1....1..0..0..1..0....1..0..1..0..1
..0..1..1..0..0....1..0..1..0..1....1..0..1..0..1....0..1..0..0..1

Crossrefs

Cf. A262420.

Sequence in context: A178639 A087392 A255534 * A248336 A332478 A144814

Adjacent sequences: A262419 A262420 A262421 * A262423 A262424 A262425

Keyword

nonn

Author

R. H. Hardin, Sep 22 2015

Status

approved