A261755 Number of (n+1)X(2+1) 0..1 arrays with each row and column prime, read as a binary number with top and left being the most significant bits.

4, 20, 19, 100, 165, 353, 885, 3548, 8661, 21544, 78052, 265612, 786316, 2171560, 6063182, 26625997, 98070255, 308244775

Offset

1,1

Comments

Column 2 of A261761.

Links

Table of n, a(n) for n=1..18.

Example

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

Crossrefs

Cf. A261761.

Sequence in context: A227997 A130316 A131745 * A288319 A330317 A151727

Adjacent sequences: A261752 A261753 A261754 * A261756 A261757 A261758

Keyword

nonn

Author

R. H. Hardin, Aug 31 2015

Status

approved