A209905 Half the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having two or four distinct clockwise edge differences

62, 13098, 16664508, 135833193008, 6954596004028468, 2253166071062026531552, 4605826850905941430535864352, 59470527831535893681344131012059952

Offset

1,1

Comments

Diagonal of A209913

Links

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

Example

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

Crossrefs

Sequence in context: A123806 A233340 A299826 * A227357 A093262 A159374

Adjacent sequences: A209902 A209903 A209904 * A209906 A209907 A209908

Keyword

nonn

Author

R. H. Hardin Mar 15 2012

Status

approved