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A274702 a(n) = number of arrangements of n circles in the affine plane in which all circles share part of their boundary with the boundary of the union of all the circles. 2
1, 2, 6, 47 (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..4.

CROSSREFS

Leading diagonal of triangle A249752.

Cf. A250001.

Sequence in context: A001587 A078537 A145502 * A072444 A052596 A098710

Adjacent sequences:  A274699 A274700 A274701 * A274703 A274704 A274705

KEYWORD

nonn,hard,more

AUTHOR

Omar E. Pol, Jul 06 2016

STATUS

approved

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Last modified October 19 22:00 EDT 2018. Contains 316378 sequences. (Running on oeis4.)