A252206 Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 1 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 1 3 4 6 or 7

19794, 44322, 332462, 1180226, 11207238, 84935426, 301990806, 2868905558, 21743274306, 77309414066, 734439412518, 5566277622866, 19791209309526, 188016488368598, 1424967069625986, 5066549580829106, 48132221017596198

Offset

1,1

Comments

Column 4 of A252210

Links

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

Formula

Empirical: a(n) = 260*a(n-3) -1023*a(n-6) -260*a(n-9) +1024*a(n-12) for n>15

Example

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

Crossrefs

Sequence in context: A253500 A253454 A237096 * A206508 A206058 A236497

Adjacent sequences: A252203 A252204 A252205 * A252207 A252208 A252209

Keyword

nonn

Author

R. H. Hardin, Dec 15 2014

Status

approved