A162794 Number of toothpicks added to the toothpick structure A139250 at the n-th even round.

0, 2, 4, 8, 8, 8, 12, 28, 16, 8, 12, 28, 20, 28, 40, 88, 32, 8, 12, 28, 20, 28, 40, 88, 36, 28, 40, 88, 56, 92, 140, 256, 64, 8, 12, 28, 20, 28, 40, 88, 36, 28, 40, 88, 56, 92, 140, 256, 68, 28, 40, 88, 56, 92, 140, 256, 88, 92, 140, 260, 172, 296, 488, 704, 128, 8, 12, 28, 20, 28

Offset

0,2

Comments

Note that these toothpicks are orthogonal to the initial toothpick in the sieve.

A bisection of A139251.

Links

Table of n, a(n) for n=0..69.

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, A139251, A159791, A159792, A162793, A162795, A162796, A162797.

Sequence in context: A129279 A008496 A178573 * A172305 A366569 A187221

Adjacent sequences: A162791 A162792 A162793 * A162795 A162796 A162797

Keyword

nonn

Author

Omar E. Pol, Jul 14 2009

Extensions

Extended by R. J. Mathar, Sep 27 2009

Status

approved