A208406 Number of nX6 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.

187, 658450, 2540446156, 9810325806914, 37884515848419250, 146298576850884166522, 564960990903273888822194, 2181708996196484728947116626, 8425102300382037852914721068050

Offset

1,1

Comments

Column 6 of A208408

Links

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

Formula

Empirical: a(n) = 3934*a(n-1) -280797*a(n-2) +6155504*a(n-3) -54994340*a(n-4) +272040900*a(n-5) -839264272*a(n-6) +1746698176*a(n-7) -2573895744*a(n-8) +2742227712*a(n-9) -2077701120*a(n-10) +970113024*a(n-11) -191102976*a(n-12) for n>13

Example

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

Crossrefs

Sequence in context: A200799 A241118 A208199 * A208413 A198905 A198252

Adjacent sequences: A208403 A208404 A208405 * A208407 A208408 A208409

Keyword

nonn

Author

R. H. Hardin, Feb 26 2012

Status

approved