The On-Line Encyclopedia of Integer Sequences (OEIS)

A209905 revision #3

A209905

Half the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having two or four distinct clockwise edge differences

62, 13098, 16664508, 135833193008, 6954596004028468, 2253166071062026531552, 4605826850905941430535864352, 59470527831535893681344131012059952

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Diagonal of A209913

LINKS

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Mar 15 2012

STATUS

editing