A206162 Number of (n+1)X(n+1) 0..3 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..3 introduced in row major order.

15, 1070, 463878, 526154358, 4224315021758, 48801583349072774

Offset

1,1

Comments

Diagonal of A206169

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Sequence in context: A205602 A370735 A233509 * A203409 A207980 A131313

Adjacent sequences: A206159 A206160 A206161 * A206163 A206164 A206165

Keyword

nonn

Author

R. H. Hardin, Feb 04 2012

Status

approved