A209714 1/4 the number of (n+1)X7 0..3 arrays with every 2X2 subblock having distinct clockwise edge differences

451762, 140274002, 41170011836, 12365282426546, 3690894707522275, 1105092894348108870, 330369121707817687620, 98846625956052689351148, 29561564907274388361999040, 8843044595935413687485979415

Offset

1,1

Comments

Column 6 of A209716

Links

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

Example

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

Crossrefs

Sequence in context: A234231 A227702 A210332 * A203785 A134960 A134888

Adjacent sequences: A209711 A209712 A209713 * A209715 A209716 A209717

Keyword

nonn

Author

R. H. Hardin Mar 11 2012

Status

approved