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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
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
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.)