A304919 - OEIS

%I #5 May 21 2018 11:26:35

%S 1,1,5,45,665,14153,399421,14137301,603647601,30231588689,

%T 1738713049013,112976375651901,8186616300733321,654642360222892057,

%U 57267075701210437229,5440407421313402397541,557802495215406348358113,61393838258161429159571873,7220049654850517272144419941,903546142463635579042416518989

%N Number of labeled hyperforests spanning {1,...,n} and allowing singleton edges.

%F Inverse binomial transform of A134956.

%e The a(2) = 5 hyperforests are the following:

%e {{1,2}}

%e {{1},{2}}

%e {{1},{1,2}}

%e {{2},{1,2}}

%e {{1},{2},{1,2}}

%Y Cf. A030019, A035053, A048143, A134954, A134955, A134956, A134957, A134959, A144959, A303838, A304717, A304867, A304911, A304912, A304918.

%K nonn

%O 0,3

%A _Gus Wiseman_, May 21 2018