1,1

Name was: Parity of positive integers of the toothpick sequence in the first quadrant A153000.

Same as A079559: reduce the g.f. of A153000 mod 2 to see this. [Joerg Arndt, Aug 07 2013]

Table of n, a(n) for n=1..105.

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

a(n) = A000035(A153000(n)). - Omar E. Pol, Aug 06 2013

Cf. A040051, A079559, A139250, A153000

Sequence in context: A137893 A108882 A284656 * A267050 A267355 A070829

Adjacent sequences: A167999 A168000 A168001 * A168003 A168004 A168005

nonn,dead

Omar E. Pol, Nov 29 2009

More terms from R. J. Mathar, Dec 04 2009

approved