A206191 Number of (n+1)X3 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock equal to two

1012, 18172, 329216, 5972392, 108363344, 1966171084, 35674679732, 647289744976, 11744575881312, 213096317372352, 3866469156691484, 70154115855170420, 1272892598372080320, 23095659424144383792, 419053017449035125152

Offset

1,1

Comments

Column 2 of A206197

Links

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

Formula

Empirical: a(n) = 23*a(n-1) -97*a(n-2) +169*a(n-3) -151*a(n-4) +250*a(n-5) -178*a(n-6) +66*a(n-7) -64*a(n-8) +8*a(n-9) +4*a(n-10)

Example

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

Crossrefs

Sequence in context: A072140 A023058 A223077 * A249987 A224920 A022054

Adjacent sequences: A206188 A206189 A206190 * A206192 A206193 A206194

Keyword

nonn

Author

R. H. Hardin Feb 04 2012

Status

approved