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A251842 Number of (n+2) X (5+2) 0..3 arrays with every 3 X 3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime. 1
1443, 2672, 8582, 18708, 79817, 277125, 616922, 2656032, 9359217, 20878370, 90230406, 320039166, 713991464, 3094337461, 11011364659, 24565215616, 106623444574, 380064039869, 847869435282, 3682986619320, 13139491573372 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 5 of A251845.
LINKS
FORMULA
Empirical: a(n) = 64*a(n-3) -1282*a(n-6) +10366*a(n-9) -44576*a(n-12) +120485*a(n-15) -214956*a(n-18) +245225*a(n-21) -170457*a(n-24) +68626*a(n-27) -15983*a(n-30) +2674*a(n-33) -185*a(n-36) for n>43.
EXAMPLE
Some solutions for n=4
..1..0..0..1..0..0..1....0..1..0..0..1..0..0....0..1..0..3..1..0..0
..1..0..3..1..0..0..1....0..1..0..0..1..0..0....1..2..1..1..2..1..1
..2..1..1..2..1..1..2....1..2..1..1..2..1..1....0..1..3..0..1..0..0
..1..0..0..1..0..3..1....3..1..0..0..1..3..0....3..1..0..0..1..0..3
..1..3..0..1..0..0..1....0..1..3..0..1..0..0....3..2..1..1..2..1..1
..2..1..1..2..1..1..2....1..2..1..1..2..1..1....0..1..0..0..1..3..0
CROSSREFS
Cf. A251845.
Sequence in context: A220651 A252224 A221872 * A105417 A105416 A348740
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 09 2014
STATUS
approved

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Last modified May 22 06:48 EDT 2024. Contains 372743 sequences. (Running on oeis4.)