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A274822 Total number of regions in all arrangements of n circles in the affine plane, including the regions that do not belong to the circles. 3
1, 7, 66 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Consider the arrangements of n circles described in A250001.

LINKS

Table of n, a(n) for n=1..3.

CROSSREFS

Row sums of triangle A274818.

For another version see A274823.

Cf. A250001, A274776.

Sequence in context: A220067 A109779 A239984 * A179880 A297310 A065097

Adjacent sequences:  A274819 A274820 A274821 * A274823 A274824 A274825

KEYWORD

nonn,hard,bref,more

AUTHOR

Omar E. Pol, Jul 07 2016

STATUS

approved

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Last modified January 20 23:29 EST 2020. Contains 331104 sequences. (Running on oeis4.)