

A187213


Number of Qtoothpicks added at nth 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
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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), 157191
Nathaniel Johnston, The QToothpick 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: A120803 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



