A205615 Number of 8X(n+1) 0..3 arrays with every 2X2 subblock having the same number of equal edges as its horizontal neighbors and a different number from its vertical neighbors, and new values 0..3 introduced in row major order

9140400, 953231848, 74880118862, 9140244711946, 833667153942097, 109899225787392773

Offset

1,1

Comments

Row 7 of A205609

Links

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

Example

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

Crossrefs

Sequence in context: A172620 A172711 A187675 * A251399 A206599 A245746

Adjacent sequences: A205612 A205613 A205614 * A205616 A205617 A205618

Keyword

nonn

Author

R. H. Hardin Jan 29 2012

Status

approved