A204048 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order

1379, 112362, 5257444, 316144367, 18962117027, 1065898305547, 58142833651117, 3205754177083715, 172892123818421614, 9330670178760104074

Offset

1,1

Comments

Diagonal of A204056

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A323814 A204056 A204049 * A209791 A051114 A139667

Adjacent sequences: A204045 A204046 A204047 * A204049 A204050 A204051

Keyword

nonn

Author

R. H. Hardin Jan 09 2012

Status

approved