A206513 Number of (n+1)X(n+1) 0..3 arrays with every 2X3 or 3X2 subblock having no more than four equal edges, and new values 0..3 introduced in row major order.

15, 10998, 177097738, 45954984167446, 190187445308482279868, 12552495871839218224290213767, 13212265000747034021229857133763537610, 221780527293845666190504578213897949211421813469

Offset

1,1

Comments

Diagonal of A206521

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A208401 A198911 A207867 * A271404 A271405 A271406

Adjacent sequences: A206510 A206511 A206512 * A206514 A206515 A206516

Keyword

nonn

Author

R. H. Hardin, Feb 08 2012

Status

approved