A160726 a(n) = A160714(n)*4.

0, 4, 8, 20, 24, 36, 48, 84, 88, 100, 112, 148, 160, 196, 232, 340, 448, 452

Offset

0,2

Comments

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

See A160172 and A160714 for more information about T-toothpick sequences.

Links

Table of n, a(n) for n=0..17.

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, A160714, A160716, A160724.

Sequence in context: A006580 A061814 A087254 * A191483 A062717 A084922

Adjacent sequences: A160723 A160724 A160725 * A160727 A160728 A160729

Keyword

nonn,more

Author

Omar E. Pol, Jun 02 2009

Extensions

a(9)-a(17) from 4*A160714(n) by Jinyuan Wang, Mar 14 2020

Status

approved