A183820 - OEIS

A183820

1/256 the number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor

1, 813, 8538066, 1163575148283, 2051388696859571241

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OFFSET

1,2

COMMENTS

Diagonal ofA183827

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions with upper left block zero for 3X3

..0..0..1....0..0..3....0..0..1....0..0..0....0..0..3....0..0..1....0..0..3

..0..0..0....0..0..3....0..0..0....0..0..3....0..0..2....0..0..3....0..0..3

..1..1..3....2..1..1....0..2..1....2..1..0....2..2..2....0..2..1....1..3..1

CROSSREFS

Sequence in context:A158667 A035854 A099116*A272606 A235976 A015159

Adjacent sequences:A183817 A183818 A183819*A183821 A183822 A183823

KEYWORD

nonn

AUTHOR

R. H. HardinJan 07 2011

STATUS

approved