A274823 Total number of regions in all arrangements of n circles in the affine plane, excluding the regions that do not belong to the circles.

1, 7, 65

Offset

1,2

Comments

In other words: not counting the regions between circles.

Consider the arrangements of n circles described in A250001.

Links

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

Crossrefs

Row sums of triangle A274819.

For another version see A274822.

Cf. A250001, A274777.

Sequence in context: A352841 A197787 A024095 * A174508 A253802 A220597

Adjacent sequences: A274820 A274821 A274822 * A274824 A274825 A274826

Keyword

nonn,hard,bref,more

Author

Omar E. Pol, Jul 07 2016

Status

approved