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0, 4, 12, 28, 44, 60, 92, 136, 168, 184, 216, 280, 376, 440, 520, 620, 684, 700, 732, 796, 892, 1020, 1164, 1332, 1508, 1588, 1684, 1860, 2116, 2276, 2452, 2664, 2792, 2808, 2840, 2904, 3000, 3128, 3272, 3448, 3656, 3824, 4016, 4272, 4676, 4992
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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COMMENTS
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This is a toothpick sequence of forking paths to 135 degrees. The sequence gives the number of toothpicks and D-toothpicks in the structure after n-th stage. A221528 (the first differences) give the number of toothpicks or D-toothpicks added at n-th stage. It appears that the structure has a fractal (or like-fractal) behavior. For more information see A194700.
First differs from A194434 at a(13).
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LINKS
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Table of n, a(n) for n=0..45.
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
Index entries for sequences related to toothpick sequences
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FORMULA
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a(n) = 4*A220524(n).
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CROSSREFS
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Cf. A139250, A194270, A194700, A194434, A220500, A220520, A220522, A221528.
Sequence in context: A194432 A220512 A194434 * A301005 A178571 A278211
Adjacent sequences: A220511 A220512 A220513 * A220515 A220516 A220517
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KEYWORD
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nonn
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AUTHOR
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Omar E. Pol, Dec 15 2012
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STATUS
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approved
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