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Number of genus 0 unsensed hypermaps with n darts.
5

%I #11 Apr 05 2018 22:42:31

%S 1,3,6,20,57,240,954,4566,22641,121823,683307,4004055

%N Number of genus 0 unsensed hypermaps with n darts.

%H Timothy R. Walsh, <a href="http://www.info2.uqam.ca/~walsh_t/papers/GENERATING NONISOMORPHIC.pdf">Space-efficient generation of nonisomorphic maps and hypermaps</a>

%H T. R. Walsh, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL18/Walsh/walsh3.html">Space-Efficient Generation of Nonisomorphic Maps and Hypermaps</a>, J. Int. Seq. 18 (2015) # 15.4.3

%Y Cf. A090371, A118094, A214819, A214820, A057005; A214821-A214823, A215017, A215018.

%K nonn,more

%O 1,2

%A _N. J. A. Sloane_, Aug 01 2012