0,2

The sequence gives the number of toothpicks in the sieve after n-th stage.

Table of n, a(n) for n=0..52.

David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

Cf. A139250, A160406, A160730, A160732, A160736, A160738, A160740.

Sequence in context: A108567 A261890 A072874 * A010072 A005943 A008233

Adjacent sequences: A160155 A160156 A160157 * A160159 A160160 A160161

nonn

Omar E. Pol, May 29 2009

Extended beyond a(13) by R. J. Mathar, Jun 01 2009

approved