A296408 Number of cylindrical connected arrangements of n pseudo-circles on a sphere, in the sense that the union of the pseudo-circles is a connected set and two cells of the arrangement are separated by each of the pseudo-circles, reduced for mirror symmetry.

1, 1, 1, 3, 20, 900, 530530

Offset

0,4

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: A089943 A108699 A162134 * A002857 A345328 A203314

Adjacent sequences: A296405 A296406 A296407 * A296409 A296410 A296411

Keyword

nonn,more

Author

Manfred Scheucher, Dec 11 2017

Status

approved