A204622 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having unequal diagonal elements or unequal antidiagonal elements, and new values 0..2 introduced in row major order

12, 2049, 2490558, 21550390395, 1327448018292252, 582081449451902347866, 1816995451072561641887723586, 40376415985445663379679403072064855, 6387126785648912581213165822171077074078454

Offset

1,1

Comments

Diagonal of A204630

Links

R. H. Hardin, Table of n, a(n) for n = 1..11

Example

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

Crossrefs

Sequence in context: A263584 A323816 A208252 * A369336 A004823 A342964

Adjacent sequences: A204619 A204620 A204621 * A204623 A204624 A204625

Keyword

nonn

Author

R. H. Hardin Jan 17 2012

Status

approved