A151551 G.f.: (1 + 3x) * Product_{n>=1} (1 + x^(2^n-1) + 2*x^(2^n)).

1, 4, 5, 7, 6, 13, 16, 13, 6, 13, 17, 20, 25, 42, 44, 25, 6, 13, 17, 20, 25, 42, 45, 32, 25, 43, 54, 65, 92, 128, 112, 49, 6, 13, 17, 20, 25, 42, 45, 32, 25, 43, 54, 65, 92, 128, 113, 56, 25, 43, 54, 65, 92, 129, 122, 89, 93, 140, 173, 222, 312, 368, 272, 97, 6, 13, 17, 20, 25, 42

Offset: 0

Author

N. J. A. Sloane, May 19 2009

Keywords

• nonn

Links

• 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

Crossrefs

Cf. A139250, A151550, A151552.