A296409 Number of digon-free 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, 1, 3, 30, 4477

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: A296173 A248728 A115040 * A296407 A308383 A065594

Adjacent sequences: A296406 A296407 A296408 * A296410 A296411 A296412

Keyword

nonn,more

Author

Manfred Scheucher, Dec 11 2017

Status

approved