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A359861 Number of edges among all distinct circles that can be constructed from a 2 X n square grid of points using only a compass. 5
4, 84, 420, 1604, 3904, 8444, 15524, 27356, 43540, 67720, 99088, 142912, 196820, 267580, 352844, 460432, 586592, 741852 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
See A359859 and A359860 for further details and images of the circles. No formula for a(n) is known.
LINKS
EXAMPLE
a(n) = A359859(n) + A359860(n) - 1 by Euler's formula.
CROSSREFS
Cf. A359859 (vertices), A359860 (regions), A359862 (k-gons), A001859, A359254.
Sequence in context: A316490 A102982 A231741 * A172138 A282588 A178208
KEYWORD
nonn,more
AUTHOR
Scott R. Shannon, Jan 16 2023
STATUS
approved

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Last modified July 18 10:00 EDT 2024. Contains 374378 sequences. (Running on oeis4.)