A252304 Number of (n+2) X (7+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 1 3 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 1 3 6 or 7.

12027, 7625, 8650, 11639, 22521, 34279, 48579, 109845, 172039, 240515, 630341, 1001223, 1372035, 4084741, 6541831, 8798211, 28880133, 46506247, 61723395, 215907589, 348800263, 459211011, 1666815237, 2697504007, 3535502595

Offset

1,1

Comments

Column 7 of A252305.

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>24.

Example

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

Crossrefs

Cf. A252305.

Sequence in context: A235308 A064966 A292815 * A251680 A247688 A236726

Adjacent sequences: A252301 A252302 A252303 * A252305 A252306 A252307

Keyword

nonn

Author

R. H. Hardin, Dec 16 2014

Status

approved