A296407 - OEIS

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.

%I #8 Dec 11 2017 17:33:33

%S 1,1,1,1,3,30,4509

%N 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.

%C For more information, see A288568.

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

%K nonn,more

%O 0,5

%A _Manfred Scheucher_, Dec 11 2017