OFFSET
0,2
COMMENTS
This is a toothpick sequence of forking paths to 135 degrees. The sequence gives the number of toothpicks and D-toothpicks in the structure after n-th stage. A221528 (the first differences) give the number of toothpicks or D-toothpicks added at n-th stage. It appears that the structure has a fractal (or fractal-like) behavior. For more information see A194700.
First differs from A194434 at a(13).
LINKS
FORMULA
a(n) = 4*A220524(n).
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Dec 15 2012
STATUS
approved