A203871 Number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order

7, 1135, 1166887, 6542729803, 200096473566151, 33391264599507183643, 30407052005824642303153447, 151104658685287487942495927080315

Offset

1,1

Comments

Diagonal of A203878

Links

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

Example

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

Crossrefs

Sequence in context: A203583 A259251 A259253 * A144927 A202133 A229431

Adjacent sequences: A203868 A203869 A203870 * A203872 A203873 A203874

Keyword

nonn

Author

R. H. Hardin Jan 07 2012

Status

approved