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A170888 Similar to A160406, but always staying outside the wedge, starting at stage 0 with a vertical half-toothpick which protrudes from the vertex of the wedge. 4
0, 1, 3, 7, 11, 15, 21, 31, 39, 43, 49, 59, 69, 81, 101, 127, 143, 147, 153, 163, 173, 185, 205, 231, 249, 261, 281, 309, 339, 381, 445, 511, 543, 547, 553, 563, 573, 585, 605, 631, 649, 661, 681, 709, 739, 781, 845, 911, 945, 957, 977, 1005, 1035, 1077, 1141 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

See A170889 for the first differences.

LINKS

Table of n, a(n) for n=0..54.

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

CROSSREFS

Cf. A139250, A170886, A170889, A170890, A170892.

Sequence in context: A310213 A109507 A160802 * A182838 A163094 A022800

Adjacent sequences:  A170885 A170886 A170887 * A170889 A170890 A170891

KEYWORD

nonn

AUTHOR

Omar E. Pol, Jan 09 2010

EXTENSIONS

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

STATUS

approved

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Last modified October 23 11:48 EDT 2019. Contains 328345 sequences. (Running on oeis4.)