A251843 Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime

1951, 5438, 21748, 48692, 277125, 1226031, 2726048, 16168331, 74290304, 163730464, 998856517, 4693337366, 10286321048, 63845445267, 303868751600, 663861257682, 4160750200373, 19942932871102, 43493338467394

Offset

1,1

Comments

Column 6 of A251845

Links

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

Formula

Empirical: a(n) = 123*a(n-3) -4692*a(n-6) +69631*a(n-9) -514311*a(n-12) +2250027*a(n-15) -6529710*a(n-18) +13126892*a(n-21) -18315243*a(n-24) +17438687*a(n-27) -11035045*a(n-30) +4492984*a(n-33) -1153262*a(n-36) +193456*a(n-39) -19536*a(n-42) for n>50

Example

Some solutions for n=4
..1..1..2..1..1..2..1..1....1..1..2..1..1..2..1..1....3..0..1..0..0..1..0..3
..0..0..1..0..0..1..0..0....0..0..1..0..0..1..0..0....1..1..2..1..1..2..1..1
..0..3..1..0..0..1..0..0....3..0..1..0..0..1..0..3....0..3..1..0..0..1..0..0
..1..1..2..1..1..2..1..1....1..1..2..1..1..2..1..1....0..0..1..3..0..1..0..3
..0..0..1..0..0..1..0..3....0..0..1..0..0..1..0..0....1..1..2..1..1..2..1..1
..0..0..1..3..0..1..3..0....3..0..1..0..0..1..0..0....3..0..1..0..0..1..0..0

Crossrefs

Sequence in context: A235003 A223464 A252062 * A249202 A249324 A249217

Adjacent sequences: A251840 A251841 A251842 * A251844 A251845 A251846

Keyword

nonn

Author

R. H. Hardin, Dec 09 2014

Status

approved