A211974 Number of E-toothpicks added at n-th stage in the structure of A161336.

0, 1, 1, 1, 3, 1, 3, 3, 3, 5, 3, 5, 7, 1, 3, 3, 5, 9, 5, 13, 7, 9, 13, 7, 11, 13, 3, 7, 7, 9, 15, 11, 21, 15, 15, 17, 11, 13, 15, 15, 15, 9, 11, 19, 13, 21, 21, 17, 17, 23, 17, 27, 17, 19, 27, 21, 27, 19, 17, 17, 21, 31, 31, 25, 23

Offset: 0

Author

Omar E. Pol, Dec 15 2012

Keywords

• nonn

Comments

Essentially the first differences of A161336.

Links

• N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
• Index entries for sequences related to toothpick sequences

Crossrefs

Cf. A139250, A139251, A161328, A161330, A213360, A211976.

Formula

a(n) = A161331(n+1)/6, n >= 1.