A210148 1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences

57, 42689, 417014920, 53276322556234, 88975418528153598168, 1942625963195375544523109688, 554481819709548465938736952622972588, 2069021570186779275218664788818854684235583075

Offset

1,1

Comments

Diagonal of A210156

Links

R. H. Hardin, Table of n, a(n) for n = 1..9

Example

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

Crossrefs

Sequence in context: A218662 A331015 A093257 * A261948 A069255 A065869

Adjacent sequences: A210145 A210146 A210147 * A210149 A210150 A210151

Keyword

nonn

Author

R. H. Hardin Mar 18 2012

Status

approved