A262413 Number of (n+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.

2, 4, 270, 18228, 9401742, 15231780324, 114043973318270, 3210825131209677780, 376663000295700912108942, 173793136176160952800090974444, 324528460592527213101965898811701630

Offset

1,1

Comments

Diagonal of A262420.

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Cf. A262420.

Sequence in context: A271551 A058990 A343255 * A363039 A012437 A012434

Adjacent sequences: A262410 A262411 A262412 * A262414 A262415 A262416

Keyword

nonn

Author

R. H. Hardin, Sep 22 2015

Status

approved