A296407 - OEIS

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A296407

Number of digon-free connected arrangements of n pseudo-circles on a sphere, in the sense that the union of the pseudo-circles is a connected set, reduced for mirror symmetry.

9

1, 1, 1, 1, 3, 30, 4509

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,5

COMMENTS

For more information, see A288568.

LINKS

Table of n, a(n) for n=0..6.

CROSSREFS

Cf. A250001, A275923, A275924, A288554-A288568, A296406, A296407-A296412, A006248.

Sequence in context: A248728 A115040 A296409 * A375530 A308383 A065594

Adjacent sequences: A296404 A296405 A296406 * A296408 A296409 A296410

KEYWORD

nonn,more

AUTHOR

Manfred Scheucher, Dec 11 2017

STATUS

approved