A205467 Number of (n+1) X (n+1) 0..2 arrays with every 2 X 2 subblock having the same number of equal edges, and new values 0..2 introduced in row major order.

14, 263, 14639, 2368164, 1002405121, 1094476686239, 3037575583505983, 21477571401148556382, 385928233193168681488351

Offset

1,1

Comments

Diagonal of A205475.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A205475.

Sequence in context: A304446 A304189 A115611 * A216986 A138560 A051690

Adjacent sequences: A205464 A205465 A205466 * A205468 A205469 A205470

Keyword

nonn

Author

R. H. Hardin, Jan 27 2012

Status

approved