G.f.: A(x) = (1/x)*Series_Reversion( x/Sum_{k=0..n} 2^[k(k-1)/2]*x^k ).
A136654
G.f.: A(x) = (1/x)*Series_Reversion( x/Sum_{k=0..n} 2^[k(k-1)/2]*x^k ).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =15a(4) =117a(5) =1565a(6) =41663a(7) =2378147a(8) =286991465a(9) =71261033273
External references
- oeis: A136654