

A151710


First differences of A160715.


7



1, 3, 3, 9, 3, 9, 9, 21, 3, 9, 9, 21, 15, 21, 27, 51, 3, 9, 9, 21, 15, 21, 27, 51, 21, 21, 27, 51
(list;
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OFFSET

1,2


COMMENTS

Number of Ytoothpick added at nth stage to the structure of A160715.
Similar to A160121. [From Omar E. Pol, May 29 2010]


LINKS

Table of n, a(n) for n=1..28.
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. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n1)1) for n >= 2.]
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS


EXAMPLE

Contribution from Omar E. Pol, Dec 18 2012 (Start):
Written as an irregular triangle begins:
1;
3;
3, 9;
3, 9, 9, 21;
3, 9, 9, 21, 15, 21, 27, 51;
3, 9, 9, 21, 15, 21, 27, 51, 21, 21, 27, 51,...
(End)


CROSSREFS

Cf. A000225, A006516, A139250, A160120.
Cf. A048883, A139251, A151837, A160121.
Sequence in context: A165824 A256689 A266533 * A160121 A048883 A241717
Adjacent sequences: A151707 A151708 A151709 * A151711 A151712 A151713


KEYWORD

more,nonn


AUTHOR

Omar E. Pol, Jun 02 2009


EXTENSIONS

More terms from Omar E. Pol, May 29 2010


STATUS

approved



