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A161832
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a(n) = (A161830(n+1)-1)/2.
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3
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0, 1, 2, 4, 5, 7, 9, 13, 15, 17, 19, 23, 26, 30, 35, 44, 49, 51
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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COMMENTS
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The sequence gives the number of Y-toothpicks in the structure after n rounds. A161833 (the first differences) gives the number added at the n-th round.
See the Y-toothpick sequence A160120 and A161830 for more information.
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LINKS
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CROSSREFS
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KEYWORD
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more,nonn
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AUTHOR
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STATUS
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approved
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