A206321 Number of (n+1)X3 0..3 arrays with every 2X3 or 3X2 subblock having exactly three clockwise edge increases

1344, 16892, 282996, 4796092, 81302880, 1377662868, 23340152044, 395403752128, 6698395782004, 113474612575628, 1922321318016168, 32565148864444732, 551670927155642340, 9345598309321513584, 158319393789428735572

Offset

1,1

Comments

Column 2 of A206327

Links

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

Formula

Empirical: a(n) = 24*a(n-1) -131*a(n-2) +200*a(n-3) -116*a(n-4) +35*a(n-5) -13*a(n-6) +2*a(n-7) for n>10

Example

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

Crossrefs

Sequence in context: A205820 A202430 A268907 * A230974 A239192 A172686

Adjacent sequences: A206318 A206319 A206320 * A206322 A206323 A206324

Keyword

nonn

Author

R. H. Hardin Feb 06 2012

Status

approved