A209508 Half the number of (n+1)X6 0..2 arrays with every 2X2 subblock having two or four distinct clockwise edge differences

729, 11673, 189801, 3102219, 50798448, 832374135, 13642432110, 223616134827, 3665458427859, 60083950172598, 984896234494740, 16144445659742595, 264640335145278948, 4337994781387301094, 71108586231270845148

Offset

1,1

Comments

Column 5 of A209511

Links

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

Formula

Empirical: a(n) = 30*a(n-1) -291*a(n-2) +1278*a(n-3) -2901*a(n-4) +3519*a(n-5) -2152*a(n-6) +516*a(n-7)

Example

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

Crossrefs

Sequence in context: A017499 A269057 A017631 * A016758 A183809 A224004

Adjacent sequences: A209505 A209506 A209507 * A209509 A209510 A209511

Keyword

nonn

Author

R. H. Hardin Mar 09 2012

Status

approved