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A206513 Number of (n+1)X(n+1) 0..3 arrays with every 2X3 or 3X2 subblock having no more than four equal edges, and new values 0..3 introduced in row major order 0
15, 10998, 177097738, 45954984167446, 190187445308482279868, 12552495871839218224290213767, 13212265000747034021229857133763537610, 221780527293845666190504578213897949211421813469 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206521

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

..0..0..0..0..1....0..0..0..0..0....0..1..0..0..0....0..0..0..0..1

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

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

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

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

CROSSREFS

Sequence in context: A208401 A198911 A207867 * A271404 A271405 A271406

Adjacent sequences:  A206510 A206511 A206512 * A206514 A206515 A206516

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 08 2012

STATUS

approved

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Last modified September 22 06:53 EDT 2020. Contains 337289 sequences. (Running on oeis4.)