0,3

Total number of toothpicks in the first quadrant of the toothpick structure of A139250 that are parallel to the initial toothpick, after n odd rounds.

Written as an irregular triangle in which the row lengths are the terms of A011782 the right border gives A002450.

Table of n, a(n) for n=0..65.

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

Index entries for sequences related to cellular automata

a(n) = (A162795(n+1) - 1)/4.

Cf. A002450, A011782, A139250, A151920, A153000, A162795, A255747.

Sequence in context: A103982 A030488 A190678 * A271371 A193978 A224486

Adjacent sequences: A255734 A255735 A255736 * A255738 A255739 A255740

nonn

Omar E. Pol, Mar 07 2015

approved