G.f.: A(x) = exp( Sum_{n>=1} A183240(n)*x^n/n ) where A183240 is the sums of the squares of multinomial coefficients.
A183241
G.f.: A(x) = exp( Sum_{n>=1} A183240(n)*x^n/n ) where A183240 is the sums of the squares of multinomial coefficients.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =18a(4) =213a(5) =4128a(6) =122638a(7) =5096305a(8) =284192429a(9) =20375905738
External references
- oeis: A183241