

A170887


First differences of toothpick sequence A170886.


4



0, 1, 2, 2, 2, 4, 6, 6, 6, 8, 12, 6, 8, 12, 18, 14, 14, 20, 20, 6, 8, 12, 18, 14, 16, 24, 26, 16, 24, 38, 46, 38, 42, 52, 36, 6, 8, 12, 18, 14, 16, 24, 26, 16, 24, 38, 46, 38, 44, 56, 42, 16, 24, 38, 46, 40, 52, 70, 64, 52, 82, 118, 126, 114, 130, 132, 68, 6, 8, 12, 18, 14, 16, 24
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OFFSET

0,3


COMMENTS

Number of toothpicks added at nth stage to the toothpick structure of A170886.  Omar E. Pol, Jan 31 2013


LINKS

Table of n, a(n) for n=0..73.
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

From Omar E. Pol, Jan 30 2013: (Start)
If written as an irregular triangle in which rows 0..3 have length 1, it appears that row j has length 2^(j4), if j >= 4.  Omar E. Pol, Jan 31 2013
0;
1;
2;
2;
2;
4,6;
6,6,8,12;
6,8,12,18,14,14,20,20;
6,8,12,18,14,16,24,26,16,24,38,46,38,42,52,36;
6,8,12,18,14,16,24,26,16,24,38,46,38,44,56,42,16,24,38,46,40,52,70,64,52,82,118,126,114,130,132,68;
6,8,12,18,14,16,24,...
(End)


CROSSREFS

Cf. A139250, A139251, A160407, A170886, A170889, A170891, A170893.
Sequence in context: A248781 A236840 A182539 * A103265 A008238 A218870
Adjacent sequences: A170884 A170885 A170886 * A170888 A170889 A170890


KEYWORD

nonn,tabf


AUTHOR

Omar E. Pol, Jan 09 2010


EXTENSIONS

More terms from R. J. Mathar, Jan 25 2010


STATUS

approved



