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 A359860 Number of regions among all distinct circles that can be constructed from a 2 X n square grid of points using only a compass. 6
 3, 45, 231, 865, 2081, 4489, 8211, 14401, 22857, 35445, 51741, 74397, 102271, 138801, 182739, 238181, 303175, 383097 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See A359859 for further details. No formula for a(n) is known. LINKS Table of n, a(n) for n=1..18. Scott R. Shannon, Image for n = 1. Scott R. Shannon, Image for n = 2. Scott R. Shannon, Image for n = 3. Scott R. Shannon, Image for n = 4. Scott R. Shannon, Image for n = 5. Scott R. Shannon, Image for n = 8. FORMULA a(n) = A359861(n) - A359859(n) + 1 by Euler's formula. CROSSREFS Cf. A359859 (vertices), A359861 (edges), A359862 (k-gons), A001859, A359253. Sequence in context: A069955 A289193 A062346 * A002682 A073595 A370954 Adjacent sequences: A359857 A359858 A359859 * A359861 A359862 A359863 KEYWORD nonn,more AUTHOR Scott R. Shannon, Jan 16 2023 STATUS approved

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Last modified July 14 16:35 EDT 2024. Contains 374322 sequences. (Running on oeis4.)