A170889 First differences of toothpick sequence A170888.

0, 1, 2, 4, 4, 4, 6, 10, 8, 4, 6, 10, 10, 12, 20, 26, 16, 4, 6, 10, 10, 12, 20, 26, 18, 12, 20, 28, 30, 42, 64, 66, 32, 4, 6, 10, 10, 12, 20, 26, 18, 12, 20, 28, 30, 42, 64, 66, 34, 12, 20, 28, 30, 42, 64, 68, 46, 42, 66, 84, 100, 146, 192, 162, 64, 4, 6, 10, 10, 12, 20, 26, 18, 12

Offset

0,3

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), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-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):
Written as an irregular triangle:
0;
1;
2;
4,4;
4,6,10,8;
4,6,10,10,12,20,26,16;
4,6,10,10,12,20,26,18,12,20,28,30,42,64,66,32;
4,6,10,10,12,20,26,18,12,20,28,30,42,64,66,34,12,20,28,30,42,64,68,46,42,66,84,100,146,192,162,64;
(End)

Crossrefs

Cf. A139250, A139251, A160407, A170887, A170888, A170891, A170893.

Sequence in context: A201629 A033827 A008217 * A182839 A043552 A325940

Adjacent sequences: A170886 A170887 A170888 * A170890 A170891 A170892

Keyword

nonn,tabf

Author

Omar E. Pol, Jan 09 2010

Extensions

Terms beyond a(10) from R. J. Mathar, Jan 25 2010

Status

approved