A209785 Half the number of (n+1)X7 0..3 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference

3520628, 2641341716, 1896474527890, 1410846309824300, 1043428174053823487, 774627496109684203370, 574519716040871948229631, 426321464405769045098450336, 316304017251899250835605915141

Offset

1,1

Comments

Column 6 of A209787

Links

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

Example

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

Crossrefs

Sequence in context: A187314 A083624 A237006 * A244620 A347054 A202570

Adjacent sequences: A209782 A209783 A209784 * A209786 A209787 A209788

Keyword

nonn

Author

R. H. Hardin Mar 13 2012

Status

approved