A252191 Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 1 3 6 or 7

13044, 15094, 20974, 34532, 57284, 87230, 147696, 246676, 385720, 640208, 1157336, 1822536, 3077456, 5975024, 9555784, 16548432, 34746832, 56403528, 100181072, 225856592, 371166280, 672778320, 1598569552, 2649299016, 4867854416

Offset

1,1

Comments

Column 7 of A252192

Links

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

Formula

Empirical: a(n) = 15*a(n-3) -70*a(n-6) +120*a(n-9) -64*a(n-12) for n>23

Example

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

Crossrefs

Sequence in context: A079230 A262659 A252638 * A256730 A234329 A165679

Adjacent sequences: A252188 A252189 A252190 * A252192 A252193 A252194

Keyword

nonn

Author

R. H. Hardin, Dec 15 2014

Status

approved