A208390 Number of nX6 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors

122, 76806, 48890520, 31112194860, 19798894881900, 12599441934740388, 8017919094401985204, 5102370957264743298996, 3247000759052439181788564, 2066297024969543787823082196, 1314931443577477050291551747028

Offset

1,1

Comments

Column 6 of A208392

Links

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

Formula

Empirical: a(n) = 649*a(n-1) -8088*a(n-2) +32724*a(n-3) -69156*a(n-4) +80352*a(n-5) -46656*a(n-6) for n>7

Example

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

Crossrefs

Sequence in context: A241112 A240705 A208320 * A282274 A208397 A098129

Adjacent sequences: A208387 A208388 A208389 * A208391 A208392 A208393

Keyword

nonn

Author

R. H. Hardin Feb 25 2012

Status

approved