

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
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



