A210154 1/4 the number of (n+1)X7 0..3 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences

34976109, 311831135649, 2769555432882273, 24608360596681275093, 218642562001425020608504, 1942625963195375544523109688, 17260102700582704755575246996125, 153354879298497422249886218777326738

Offset

1,1

Comments

Column 6 of A210156

Links

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

Example

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

Crossrefs

Sequence in context: A289957 A263893 A250573 * A216399 A015379 A147714

Adjacent sequences: A210151 A210152 A210153 * A210155 A210156 A210157

Keyword

nonn

Author

R. H. Hardin Mar 18 2012

Status

approved