0,4

Table of n, a(n) for n=0..60.

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(2^k) = (4^k-4)/3 for k >= 2. - N. J. A. Sloane, Feb 13 2010.

Partial sums of A168131.

Sequence in context: A058615 A082612 A339569 * A122413 A297661 A342333

Adjacent sequences: A170923 A170924 A170925 * A170927 A170928 A170929

nonn

Omar E. Pol, Jan 18 2010

Edited and extended by N. J. A. Sloane, Feb 01 2010

approved