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A160724
a(n) = A160714(n)*3.
2
0, 3, 6, 15, 18, 27, 36, 63, 66, 75, 84, 111, 120, 147, 174, 255, 336, 339
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
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.]
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Omar E. Pol, Jun 02 2009
EXTENSIONS
a(9)-a(17) from 3*A160714(n) by Jinyuan Wang, Mar 14 2020
STATUS
approved