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A151669 G.f.: Prod_{k >= 0} (1+2*x^(4^k)). 18

%I

%S 1,2,0,0,2,4,0,0,0,0,0,0,0,0,0,0,2,4,0,0,4,8,0,0,0,0,0,0,0,0,0,0,0,0,

%T 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,4,0,0,

%U 4,8,0,0,0,0,0,0,0,0,0,0,4,8,0,0,8,16,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0

%N G.f.: Prod_{k >= 0} (1+2*x^(4^k)).

%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>

%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>

%Y For generating functions Prod_{k>=0} (1+a*x^(b^k)) for the following values of (a,b) see: (1,2) A000012 and A000027, (1,3) A039966 and A005836, (1,4) A151666 and A000695, (1,5) A151667 and A033042, (2,2) A001316, (2,3) A151668, (2,4) A151669, (2,5) A151670, (3,2) A048883, (3,3) A117940, (3,4) A151665, (3,5) A151671, (4,2) A102376, (4,3) A151672, (4,4) A151673, (4,5) A151674.

%K nonn

%O 0,2

%A _N. J. A. Sloane_, May 30 2009

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Last modified October 20 17:39 EDT 2018. Contains 316394 sequences. (Running on oeis4.)