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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 1
974, 508, 1803, 5860, 79817, 1226031, 6811452, 332307262, 17060512419, 115557808374, 20390744213799, 3669049306262240, 27687623355417760, 18066638677524861299, 11720523110601342578534, 93975548122075184849030 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 24 01:21 EDT 2020. Contains 337315 sequences. (Running on oeis4.)