0,2

Table of n, a(n) for n=0..68.

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

Sum_{i=0 .. 2^k - 1} a(i) = 4^i - 2^i - 2 for k >= 2 (cf. A170940).

Sequence in context: A268741 A263031 A004493 * A245085 A299420 A019836

Adjacent sequences: A170926 A170927 A170928 * A170930 A170931 A170932

nonn

N. J. A. Sloane, Feb 04 2010

approved