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A251945 Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum prime and every diagonal and antidiagonal sum nonprime 1
1933, 1251, 2272, 3572, 8756, 21326, 47034, 116348, 285990, 648986, 1600960, 3954974, 9038718, 22223456, 55101272, 126511418, 310210760, 771368188, 1777412512, 4348909608, 10838707484, 25045428046, 61176606276, 152743298468 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A251950

LINKS

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

FORMULA

Empirical: a(n) = 26*a(n-3) -181*a(n-6) +246*a(n-9) -854*a(n-12) +1447*a(n-15) -1905*a(n-18) +2336*a(n-21) -2643*a(n-24) +1561*a(n-27) -32*a(n-30) for n>33

EXAMPLE

Some solutions for n=4

..3..0..2..0..3....1..0..1..1..0....1..3..1..1..0....0..0..2..3..0

..1..1..0..1..1....3..2..0..3..2....0..2..0..0..2....1..1..0..1..1

..1..1..0..1..1....1..0..1..1..0....1..0..1..1..0....1..1..3..1..1

..0..0..2..0..3....1..0..1..1..3....1..3..1..1..0....3..0..2..0..3

..1..1..0..1..1....3..2..0..0..2....0..2..0..0..2....1..1..0..1..1

..1..1..0..1..1....1..0..1..1..0....1..0..1..1..0....1..1..0..1..1

CROSSREFS

Sequence in context: A221015 A227491 A277943 * A340843 A270265 A237010

Adjacent sequences:  A251942 A251943 A251944 * A251946 A251947 A251948

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 11 2014

STATUS

approved

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Last modified January 26 23:54 EST 2022. Contains 350601 sequences. (Running on oeis4.)