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

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: A176848 A058615 A082612 * A122413 A297661 A136366

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