A206058 Number of (n+1)X4 0..3 arrays with every 2X3 or 3X2 subblock having exactly two clockwise edge increases

19832, 167960, 1278672, 11155584, 101369476, 910785080, 8150091296, 73102971728, 659630705472, 5908995673000, 53009382259744, 478167664129504, 4283688188281176, 38437914754884704, 346627362250708048

Offset

1,1

Comments

Column 3 of A206063

Links

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

Formula

Empirical: a(n) = a(n-2) +695*a(n-3) +2*a(n-4) +1693*a(n-5) -1278*a(n-7) +682*a(n-9) +286*a(n-11) +32*a(n-13) for n>20

Example

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

Crossrefs

Sequence in context: A237096 A252206 A206508 * A236497 A194197 A250703

Adjacent sequences: A206055 A206056 A206057 * A206059 A206060 A206061

Keyword

nonn

Author

R. H. Hardin Feb 03 2012

Status

approved