A209943 Half the number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having at most one duplicate clockwise edge difference

34, 4975, 4681176, 28414622976, 1111386232102422, 280228918282467201434, 455417252425855582254656088, 4770739366042378532001509022194668, 322127888969925272433863054772450693097784

Offset

1,1

Comments

Diagonal of A209951

Links

R. H. Hardin, Table of n, a(n) for n = 1..11

Example

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

Crossrefs

Sequence in context: A212034 A297072 A232900 * A187708 A231084 A291976

Adjacent sequences: A209940 A209941 A209942 * A209944 A209945 A209946

Keyword

nonn

Author

R. H. Hardin Mar 16 2012

Status

approved