A252013 Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and column sum 1 3 6 or 8 and every diagonal and antidiagonal sum not 1 3 6 or 8

2458, 4570, 8930, 16994, 58970, 159514, 303906, 1091906, 2992258, 5688946, 20991418, 58157050, 110567106, 415631962, 1160467354, 2206069826, 8400830074, 23579015866, 44821554626, 172160697370, 484878952282, 921675795266

Offset

1,1

Comments

Column 6 of A252015

Links

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

Formula

Empirical: a(n) = a(n-1) +34*a(n-3) -34*a(n-4) -273*a(n-6) +273*a(n-7) for n>17

Example

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

Crossrefs

Sequence in context: A282872 A191383 A206409 * A252105 A252098 A252097

Adjacent sequences: A252010 A252011 A252012 * A252014 A252015 A252016

Keyword

nonn

Author

R. H. Hardin, Dec 12 2014

Status

approved