
0, 4, 12, 28, 44, 60, 92, 136, 168, 184, 216, 280, 376, 440, 520, 620, 684, 700, 732, 796, 892, 1020, 1164, 1332, 1508, 1588, 1684, 1860, 2116, 2276, 2452, 2664, 2792, 2808, 2840, 2904, 3000, 3128, 3272, 3448, 3656, 3824, 4016, 4272, 4676, 4992
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OFFSET

0,2


COMMENTS

This is a toothpick sequence of forking paths to 135 degrees. The sequence gives the number of toothpicks and Dtoothpicks in the structure after nth stage. A221528 (the first differences) give the number of toothpicks or Dtoothpicks added at nth stage. It appears that the structure has a fractal (or likefractal) behavior. For more information see A194700.
First differs from A194434 at a(13).


LINKS

Table of n, a(n) for n=0..45.
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
Index entries for sequences related to toothpick sequences


FORMULA

a(n) = 4*A220524(n).


CROSSREFS

Cf. A139250, A194270, A194700, A194434, A220500, A220520, A220522, A221528.
Sequence in context: A194432 A220512 A194434 * A301005 A178571 A278211
Adjacent sequences: A220511 A220512 A220513 * A220515 A220516 A220517


KEYWORD

nonn


AUTHOR

Omar E. Pol, Dec 15 2012


STATUS

approved

