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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
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.
FORMULA
a(n) = A250001(n) - A000081(n+1).
CROSSREFS
Row sums of A261070 except its column k = 0.
Sequence in context: A190903 A303486 A064747 * A278096 A272499 A305604
KEYWORD
nonn,bref,hard,more
AUTHOR
Omar E. Pol, May 17 2017
STATUS
approved