A209779 Half the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference

64, 12492, 13606964, 89046135210, 3413352967754696, 774627496109684203370, 1034141529418861531701953000, 8145663030420623706384712975053986

Offset

1,1

Comments

Diagonal of A209787

Links

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

Example

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

Crossrefs

Sequence in context: A374886 A364520 A376524 * A220300 A316485 A292025

Adjacent sequences: A209776 A209777 A209778 * A209780 A209781 A209782

Keyword

nonn

Author

R. H. Hardin Mar 13 2012

Status

approved