A160714 T-toothpick sequence starting at the corner of an infinite square, but with angle = Pi/4.

0, 1, 2, 5, 6, 9, 12, 21, 22, 25, 28, 37, 40, 49, 58, 85, 112, 113

Offset: 0

Author

Omar E. Pol, Jun 02 2009

Keywords

• more
• nonn

Comments

The sequence gives the number of T-toothpicks after n rounds.

See A160172 for more information about T-toothpick sequences.

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, A160172, A160173.