A209943 - OEIS

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

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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