A252209 Number of (n+2)X(7+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

278710, 2568954, 65275092, 301990806, 10519316686, 267361717782, 1236950586236, 43087111929354, 1095113581291852, 5066549580829014, 176484810397704526, 4485585228861223254, 20752587082923540860

Offset

1,1

Comments

Column 7 of A252210

Links

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

Formula

Empirical: a(n) = 4104*a(n-3) -32767*a(n-6) -4104*a(n-9) +32768*a(n-12) for n>15

Example

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

Crossrefs

Sequence in context: A186879 A224252 A236017 * A043601 A043867 A204396

Adjacent sequences: A252206 A252207 A252208 * A252210 A252211 A252212

Keyword

nonn

Author

R. H. Hardin, Dec 15 2014

Status

approved