A251837 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime

974, 508, 1803, 5860, 79817, 1226031, 6811452, 332307262, 17060512419, 115557808374, 20390744213799, 3669049306262240, 27687623355417760, 18066638677524861299, 11720523110601342578534, 93975548122075184849030

Offset

1,1

Comments

Diagonal of A251845

Links

R. H. Hardin, Table of n, a(n) for n = 1..17

Example

Some solutions for n=4
..3..1..0..0..1..0....1..0..0..1..3..0....0..1..0..0..1..0....1..0..0..1..0..3
..0..1..0..3..1..0....3..3..0..1..0..0....1..2..1..1..2..1....2..1..1..2..1..1
..1..2..1..1..2..1....2..1..1..2..1..1....0..1..0..3..1..0....1..3..0..1..0..0
..0..1..0..0..1..0....1..0..3..1..0..0....0..1..0..0..1..3....1..0..0..1..0..0
..3..1..0..3..1..0....1..0..0..1..3..0....1..2..1..1..2..3....2..1..1..2..1..1
..1..2..1..1..2..1....2..1..1..2..1..1....0..1..0..0..1..0....1..0..0..1..0..0

Crossrefs

Sequence in context: A209017 A232409 A275060 * A251838 A251845 A254072

Adjacent sequences: A251834 A251835 A251836 * A251838 A251839 A251840

Keyword

nonn

Author

R. H. Hardin, Dec 09 2014

Status

approved