E.g.f.: -log( Sum_{n>=0} (-x)^(n*(n+1)/2) / (n*(n+1)/2)! ).

A205803

E.g.f.: -log( Sum_{n>=0} (-x)^(n*(n+1)/2) / (n*(n+1)/2)! ).

Terms

    a(0) =1a(1) =1a(2) =3a(3) =10a(4) =44a(5) =249a(6) =1693a(7) =13384a(8) =120932a(9) =1229759a(10) =13894429a(11) =172677450a(12) =2341111850a(13) =34385290940a(14) =543885462121

External references