A161828 Number of rhombuses in the Y-toothpick structure of A160120 after n rounds.

0, 0, 3, 3, 9, 9, 15, 21, 33, 39

Offset

0,3

Links

Table of n, a(n) for n=0..9.

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

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

Crossrefs

Cf. A139250, A160120, A160124, A161419, A161418, A161836.

Sequence in context: A204099 A062234 A168329 * A219128 A217964 A086739

Adjacent sequences: A161825 A161826 A161827 * A161829 A161830 A161831

Keyword

more,nonn

Author

Omar E. Pol, Jun 21 2009

Status

approved