A208868 Number of nX4 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors

15, 1798, 307165, 52947540, 9130195864, 1574432811027, 271499374919883, 46818078167209471, 8073434644321782464, 1392204668383719239473, 240075497495975972163390, 41399261047580372916745574

Offset

1,1

Comments

Column 4 of A208872

Links

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

Formula

Empirical: a(n) = 198*a(n-1) -4637*a(n-2) +40574*a(n-3) -164314*a(n-4) +321776*a(n-5) -281785*a(n-6) +85300*a(n-7) -8100*a(n-8) for n>9

Example

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

Crossrefs

Sequence in context: A122184 A069450 A205346 * A070862 A077730 A110103

Adjacent sequences: A208865 A208866 A208867 * A208869 A208870 A208871

Keyword

nonn

Author

R. H. Hardin Mar 02 2012

Status

approved