A206079 Number of (n+1)X3 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock equal to one

960, 13672, 187144, 2567488, 35195768, 482548752, 6615795040, 90703800392, 1243565136120, 17049501235304, 233751713986960, 3204777864965096, 43938078463070080, 602398924621561376, 8258997140090964632

Offset

1,1

Comments

Column 2 of A206085

Links

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

Formula

Empirical: a(n) = 15*a(n-1) -14*a(n-2) -61*a(n-3) +154*a(n-4) -152*a(n-5) +198*a(n-6) -166*a(n-7) +64*a(n-8) -28*a(n-9) +8*a(n-10)

Example

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

Crossrefs

Sequence in context: A330496 A057666 A046788 * A203732 A157851 A278011

Adjacent sequences: A206076 A206077 A206078 * A206080 A206081 A206082

Keyword

nonn

Author

R. H. Hardin Feb 03 2012

Status

approved