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A220512
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D-toothpick sequence of the third kind starting with a cross formed by 4 toothpicks.
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3
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0, 4, 12, 28, 44, 60, 88, 136, 168, 184, 216, 280, 344, 424, 508, 620, 684, 700, 732, 796, 892, 1004, 1148, 1324, 1460, 1572, 1668, 1844, 2020, 2228, 2424, 2664, 2792, 2808, 2840, 2904, 3000, 3112, 3264
(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. A221565 (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 A194432 at a(14).
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LINKS
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Table of n, a(n) for n=0..38.
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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CROSSREFS
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Cf. A139250, A194270, A194432, A194700, A220500, A220514, A220520, A220522, A220524, A220526.
Sequence in context: A072182 A009906 A194432 * A194434 A220514 A301005
Adjacent sequences: A220509 A220510 A220511 * A220513 A220514 A220515
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KEYWORD
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nonn,more
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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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