E.g.f.: P(x)/exp(2) + Q(x), where P(x) = 1/Product_{n>=1} (1 - x^n/n) and Q(x) = Sum_{n>=1} -(-2)^n/Product_{k=1..n} (k - x^k).
A249478
E.g.f.: P(x)/exp(2) + Q(x), where P(x) = 1/Product_{n>=1} (1 - x^n/n) and Q(x) = Sum_{n>=1} -(-2)^n/Product_{k=1..n} (k - x^k).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =5a(4) =12a(5) =88a(6) =496a(7) =4032a(8) =32072a(9) =335144a(10) =3443928a(11) =41477176a(12) =523289472a(13) =7298441952a(14) =107525078304
External references
- oeis: A249478