A209806 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having two distinct values, and new values 0..3 introduced in row major order

7, 302, 43209, 20873080, 32449786403, 163050586738067, 2632434564856390561, 137193223429735040307661

Offset

1,1

Comments

Diagonal of A209814

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A096348 A281435 A015005 * A257919 A002437 A376464

Adjacent sequences: A209803 A209804 A209805 * A209807 A209808 A209809

Keyword

nonn

Author

R. H. Hardin Mar 13 2012

Status

approved