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A061289
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Consider a network of triangles consisting of an equilateral triangle divided into n^2 equilateral triangles plus a circle connecting the vertices of the main triangle. Sequence gives minimal number of corner turns required to trace the network in one continuous line.
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OFFSET
| 1,1
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REFERENCES
| Martin Gardner, More Mathematical Puzzles and Diversions, page 63, "a network tracing puzzle".
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EXAMPLE
| a(1)=3 since you have to make two turns to trace the triangle and one to cover the circular part of the network.
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CROSSREFS
| Sequence in context: A067073 A124273 A038923 * A063226 A063239 A040106
Adjacent sequences: A061286 A061287 A061288 * A061290 A061291 A061292
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KEYWORD
| hard,nonn
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AUTHOR
| Brian Wallace (wallacebrianedward(AT)yahoo.co.uk), May 22 2001
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