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A188346 Number of hearts present in the n-th generation of the Q-toothpick sequence A187210. 5
0, 0, 0, 0, 0, 2, 4, 4, 4, 8, 12, 12, 12, 16, 20, 20, 28, 44, 52, 52, 52, 56, 60, 60, 68, 84, 92, 92, 96, 108, 116, 124, 156, 196, 212, 212, 212, 216, 220, 220, 228, 244, 252, 252, 256, 268, 276, 284, 316, 356, 372, 372, 376, 388, 396 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,6
COMMENTS
See A187210 for a description of the different shapes that appear in the Q-toothpick sequence.
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.]
FORMULA
It appears that a(n) = A211008(n-2,2), n >= 3. (Checked by hand up n = 130 in the toothpick structure of A139250). - Omar E. Pol, Sep 25 2012
CROSSREFS
Sequence in context: A139251 A342272 A182635 * A309690 A173531 A122788
KEYWORD
nonn
AUTHOR
Nathaniel Johnston, Mar 28 2011
STATUS
approved

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Last modified June 17 12:36 EDT 2024. Contains 373445 sequences. (Running on oeis4.)