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A187213 Number of Q-toothpicks added at n-th stage to the structure of A187212. 3
0, 1, 2, 2, 4, 4, 8, 10, 8, 4, 8, 12, 12, 16, 28, 30, 16, 4, 8, 12, 12, 16, 28, 32, 20, 16, 28, 36, 40, 60, 88, 78, 32, 4, 8, 12, 12, 16, 28, 32, 20, 16, 28, 36, 40, 60, 88, 80, 36, 16, 28, 36, 40, 60, 88, 84, 56, 60, 92, 112 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Essentially the first differences of A187212.

LINKS

Table of n, a(n) for n=0..59.

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

Nathaniel Johnston, The Q-Toothpick Cellular Automaton

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

FORMULA

It appears that if n = 2^k - 1, for k >= 2, then a(n) = A139251(n) - 2 otherwise a(n) = A139251(n). - Omar E. Pol, Mar 30 2011

EXAMPLE

Contribution from Omar E. Pol, Mar 29 2011 (Start):

If written as a triangle begins:

0,

1,

2,

2,4,

4,8,10,8,

4,8,12,12,16,28,30,16,

4,8,12,12,16,28,32,20,16,28,36,40,60,88,78,32,

(End)

CROSSREFS

Cf. A139250, A139251, A187211, A187212, A187221.

Sequence in context: A318770 A284613 A000011 * A022476 A000013 A064484

Adjacent sequences:  A187210 A187211 A187212 * A187214 A187215 A187216

KEYWORD

nonn

AUTHOR

Omar E. Pol, Mar 22 2011

EXTENSIONS

Terms after a(24) from Nathaniel Johnston, Mar 28 2011

STATUS

approved

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Last modified October 16 21:57 EDT 2018. Contains 316275 sequences. (Running on oeis4.)