A161214 a(n) = A161210(n)*3.

0, 3, 9, 21, 42, 63, 84

Offset: 0

Author

Omar E. Pol, Jun 06 2009

Keywords

• more
• nonn

Links

• David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata, Congressus Numerantium, Vol. 206 (2010), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-1) for n >= 2.]
• N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

Crossrefs

Cf. A139250, A152980, A153006, A160160, A161210, A161212, A161215, A161216.