A209954 Number of (n+1)X3 0..2 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences

567, 12161, 260201, 5569307, 119198607, 2551206049, 54603359537, 1168673933963, 25013090104279, 535354363340225, 11458172261417433, 245238893701357211, 5248840184974455807, 112340758338207683457, 2404425652140227799457

Offset

1,1

Comments

Column 2 of A209960

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 24*a(n-1) -23*a(n-2) -678*a(n-3) -472*a(n-4) +1196*a(n-5) +448*a(n-6) -416*a(n-7)

Example

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

Crossrefs

Sequence in context: A051372 A252599 A023099 * A233057 A087424 A134922

Adjacent sequences: A209951 A209952 A209953 * A209955 A209956 A209957

Keyword

nonn

Author

R. H. Hardin Mar 16 2012

Status

approved