A209786 Half the number of (n+1)X8 0..3 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference

31161462, 56780957220, 98317767405921, 177700386195973368, 318751987571164698772, 574519716040871948229631, 1034141529418861531701953000, 1862712693163882110368869710778

Offset

1,1

Comments

Column 7 of A209787

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A288087 A203276 A182088 * A251530 A125574 A215414

Adjacent sequences: A209783 A209784 A209785 * A209787 A209788 A209789

Keyword

nonn

Author

R. H. Hardin Mar 13 2012

Status

approved