A210308 Number of (n+1)X8 0..3 arrays containing all values 0..3 with every 2X2 subblock having one or three distinct values, and new values 0..3 introduced in row major order.

4266246, 7657326365, 13436313660615, 23591932615876019, 41416867662718913763, 72710583058655511309563, 127648944948853198818703027, 224097463695162713946579883851

Offset

1,1

Comments

Column 7 of A210309

Links

R. H. Hardin, Table of n, a(n) for n = 1..171

Example

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

Crossrefs

Sequence in context: A209395 A159714 A232351 * A393481 A205271 A234168

Adjacent sequences: A210305 A210306 A210307 * A210309 A210310 A210311

Keyword

nonn

Author

R. H. Hardin, Mar 19 2012

Status

approved