A209946 Half the number of (n+1)X4 0..2 arrays with every 2X2 subblock having at most one duplicate clockwise edge difference

1956, 95794, 4681176, 228881560, 11189540644, 547050257224, 26744766723116, 1307528820052772, 63923934952292560, 3125185427989687616, 152787584448820608188, 7469651552006206125720, 365184739125765545143672

Offset

1,1

Comments

Column 3 of A209951

Links

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

Formula

Empirical: a(n) = 33*a(n-1) +910*a(n-2) -4144*a(n-3) -120239*a(n-4) +146790*a(n-5) +3697440*a(n-6) -7775700*a(n-7) -10672444*a(n-8) +36750032*a(n-9) -27740400*a(n-10) +5919872*a(n-11) +335232*a(n-12) -55296*a(n-13)

Example

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

Crossrefs

Sequence in context: A116211 A234560 A232389 * A200857 A351680 A157627

Adjacent sequences: A209943 A209944 A209945 * A209947 A209948 A209949

Keyword

nonn

Author

R. H. Hardin Mar 16 2012

Status

approved