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A251841 Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime 1
872, 1229, 2890, 5860, 18708, 48692, 100973, 328235, 861182, 1788541, 5811485, 15259891, 31702266, 102964722, 270439630, 561937573, 1824434189, 4793021422, 9960951265, 32328609957, 84950562777, 176575774214, 572879745560 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A251845
LINKS
FORMULA
Empirical: a(n) = 41*a(n-3) -521*a(n-6) +2122*a(n-9) -3698*a(n-12) +2906*a(n-15) -927*a(n-18) +157*a(n-21) -89*a(n-24) +10*a(n-27) for n>32
EXAMPLE
Some solutions for n=4
..1..0..0..1..0..3....1..2..1..1..2..1....0..1..0..0..1..0....2..1..1..2..1..1
..1..0..3..1..0..0....0..1..0..0..1..0....0..1..3..0..1..3....0..2..2..0..2..2
..2..1..1..2..1..1....3..1..0..3..1..0....1..2..1..1..2..1....2..1..1..2..1..1
..1..0..0..1..0..0....1..2..1..1..2..1....0..1..0..0..1..0....2..1..1..2..1..1
..1..0..3..1..0..3....0..1..0..0..1..0....0..1..0..3..1..0....0..2..2..0..2..2
..2..1..1..2..1..1....0..1..3..0..1..3....1..2..1..1..2..1....2..1..1..2..1..3
CROSSREFS
Sequence in context: A031783 A253167 A214285 * A251085 A334011 A206312
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 09 2014
STATUS
approved

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Last modified June 18 02:31 EDT 2024. Contains 373468 sequences. (Running on oeis4.)