1,1

Table of n, a(n) for n=1..75.

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

a(n)=3*A060632(n). [From R. J. Mathar, Feb 03 2010]

Cf. A139251, A151566, A160743, A160744.

Sequence in context: A271668 A072464 A262871 * A105676 A127739 A327142

Adjacent sequences: A160742 A160743 A160744 * A160746 A160747 A160748

nonn

Omar E. Pol, May 25 2009

Terms beyond a(7) from R. J. Mathar, Feb 03 2010

approved