E.g.f.: A(x) = exp( Sum_{n>=1} x^(n*(n+1)/2) / (n*(n+1)/2) ).
A193374
E.g.f.: A(x) = exp( Sum_{n>=1} x^(n*(n+1)/2) / (n*(n+1)/2) ).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =9a(5) =21a(6) =201a(7) =1191a(8) =4593a(9) =36009a(10) =620721a(11) =5297931a(12) =40360761a(13) =474989373a(14) =4345942329a(15) =122776895151
External references
- oeis: A193374