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

Author

Omar E. Pol, Jun 21 2009

Keywords

• more
• nonn

Links

• 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, A160120, A160124, A161419, A161418, A161836.