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 A372616 Number of curved edges among all distinct circles that can be constructed from the 3 vertices and the equally spaced 3*n points placed on the sides of an equilateral triangle, using only a compass. 5
 12, 207, 1104, 4359, 14880, 32523, 73662, 121605, 223290, 329286, 554286, 722841, 1145091 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS A circle is constructed for every pair of the 3 + 3*n points, the first point defines the circle's center while the second the radius distance. See A372614 and A372615 for images of the circles. LINKS Table of n, a(n) for n=0..12. FORMULA a(n) = A372614(n) + A372615(n) - 1 by Euler's formula. CROSSREFS Cf. A372614 (vertices), A372615 (regions), A372617 (k-gons), A372682 (number of circles), A371375, A356358, A360353. Sequence in context: A097193 A051688 A198529 * A151590 A297311 A217703 Adjacent sequences: A372613 A372614 A372615 * A372617 A372618 A372619 KEYWORD nonn,more AUTHOR Scott R. Shannon, May 07 2024 STATUS approved

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Last modified September 12 05:07 EDT 2024. Contains 375842 sequences. (Running on oeis4.)