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A188346
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Number of hearts present in the n-th generation of the Q-toothpick sequence A187210.
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5
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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;
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refs;
listen;
history;
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internal format)
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OFFSET
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0,6
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COMMENTS
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See A187210 for a description of the different shapes that appear in the Q-toothpick sequence.
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LINKS
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Nathaniel Johnston, Table of n, a(n) for n = 0..181
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.]
Nathaniel Johnston, The Q-Toothpick Cellular Automaton
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
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FORMULA
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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
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CROSSREFS
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Cf. A187210, A188344, A188345.
Sequence in context: A139251 A342272 A182635 * A309690 A173531 A122788
Adjacent sequences: A188343 A188344 A188345 * A188347 A188348 A188349
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KEYWORD
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nonn
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AUTHOR
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Nathaniel Johnston, Mar 28 2011
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STATUS
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approved
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