A205619 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock in a row having an equal number of equal diagonal or equal antidiagonal elements, adjacent rows differing in this number, and new values 0..2 introduced in row major order

14, 306, 13068, 1103436, 188139156, 63787803360, 44843430265344, 60947906705204832

Offset

1,1

Comments

Diagonal of A205626

Links

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

Example

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

Crossrefs

Sequence in context: A276699 A258491 A251220 * A034912 A250966 A213466

Adjacent sequences: A205616 A205617 A205618 * A205620 A205621 A205622

Keyword

nonn

Author

R. H. Hardin Jan 29 2012

Status

approved