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Number of one-sided arrangements of n pseudo-circles in the affine plane.
1

%I #10 Jun 14 2017 14:51:17

%S 1,1,3,14,200,30630

%N Number of one-sided arrangements of n pseudo-circles in the affine plane.

%C These counts have not been reduced for mirror symmetry.

%C See A250001, the main entry for this problem, for further information.

%Y Cf. A250001, A275923, A275924, A288554-A288568.

%K nonn,more

%O 0,3

%A _N. J. A. Sloane_, Jun 13 2017, based on information supplied by _Jon Wild_ on Aug 31 2016.