%N First differences of A160744.
%H David Applegate, Omar E. Pol and N. J. A. Sloane, <a href="http://neilsloane.com/doc/tooth.pdf">The Toothpick Sequence and Other Sequences from Cellular Automata</a>, 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.]
%H N. J. A. Sloane, <a href="/wiki/Catalog_of_Toothpick_and_CA_Sequences_in_OEIS">Catalog of Toothpick and Cellular Automata Sequences in the OEIS</a>
%F a(n)=3*A060632(n). [From _R. J. Mathar_, Feb 03 2010]
%Y Cf. A139251, A151566, A160743, A160744.
%A _Omar E. Pol_, May 25 2009
%E Terms beyond a(7) from _R. J. Mathar_, Feb 03 2010