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A161412
V-toothpick sequence starting at the corner of an infinite square from which protrudes a half toothpick with an angle = Pi/6.
4
0, 1, 2, 3, 5, 9, 12, 15, 19, 25, 29, 34, 39, 49, 58, 63
OFFSET
0,3
COMMENTS
The sequence gives the number of V-toothpicks in the structure after n rounds. A161413 (the first differences) gives the number added at the n-th round.
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.]
CROSSREFS
V-toothpick sequence: A161206.
Sequence in context: A334264 A141403 A124204 * A099420 A184794 A144728
KEYWORD
more,nonn
AUTHOR
Omar E. Pol, Jun 10 2009
STATUS
approved