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A285995 Number of arrangements of n circles in the affine plane such that at least two of the circles meet. 1
0, 0, 1, 10, 164 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

A subset the arrangements of n circles described in A250001, which is the main entry for this sequence.

See also the comments related to A000081 from Benoit Jubin and N. J. A. Sloane in A250001.

LINKS

Table of n, a(n) for n=0..4.

FORMULA

a(n) = A250001(n) - A000081(n+1).

CROSSREFS

Row sums of A261070 except its column k = 0.

Cf. A000081, A250001.

Sequence in context: A074703 A190903 A064747 * A278096 A272499 A054688

Adjacent sequences:  A285992 A285993 A285994 * A285996 A285997 A285998

KEYWORD

nonn,bref,hard,more

AUTHOR

Omar E. Pol, May 17 2017

STATUS

approved

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Last modified February 23 13:38 EST 2018. Contains 299581 sequences. (Running on oeis4.)