A188344 Number of circles present in the n-th generation of the Q-toothpick sequence A187210.

0, 0, 0, 1, 1, 3, 3, 3, 9, 13, 15, 15, 21, 25, 27, 31, 45, 53, 55, 55, 61, 65, 67, 71, 85, 93, 95, 99, 113, 121, 127, 147, 181, 197, 199, 199, 205, 209, 211, 215, 229, 237, 239, 243, 257, 265, 271, 291, 325, 341, 343

Offset

0,6

Comments

See A187210 for a description of the different shapes that appear in the Q-toothpick sequence.

Links

Nathaniel Johnston, Table of n, a(n) for n = 0..181

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.]

Nathaniel Johnston, The Q-Toothpick Cellular Automaton

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

Crossrefs

Cf. A187210, A188345, A188346.

Sequence in context: A060828 A332337 A161808 * A217457 A231753 A231663

Adjacent sequences: A188341 A188342 A188343 * A188345 A188346 A188347

Keyword

nonn

Author

Nathaniel Johnston, Mar 28 2011

Status

approved