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A251844 Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime 1
2784, 9647, 40492, 100973, 616922, 2726048, 6811452, 41181626, 182794163, 457065675, 2755684055, 12239107983, 30610006209, 184445367947, 819388421574, 2049720229955, 12346166194821, 54857889018442, 137257302547126 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A251845

LINKS

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

FORMULA

Empirical: a(n) = 165*a(n-3) -9038*a(n-6) +195335*a(n-9) -2203601*a(n-12) +15341600*a(n-15) -73455549*a(n-18) +243919138*a(n-21) -516775060*a(n-24) +667463786*a(n-27) -513879699*a(n-30) +227087898*a(n-33) -48471310*a(n-36) -184440*a(n-39) -299304*a(n-42) +1669248*a(n-45) -399168*a(n-48) for n>56

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A251200 A188415 A236125 * A237230 A206516 A119377

Adjacent sequences:  A251841 A251842 A251843 * A251845 A251846 A251847

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 09 2014

STATUS

approved

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Last modified January 22 02:46 EST 2022. Contains 350481 sequences. (Running on oeis4.)