G.f. A(x) satisfies A(x) = ( (1 + x*A(x)^3)/(1 - x*A(x)) )^2.
A379244
G.f. A(x) satisfies A(x) = ( (1 + x*A(x)^3)/(1 - x*A(x)) )^2.
Terms
- a(0) =1a(1) =4a(2) =40a(3) =540a(4) =8400a(5) =141876a(6) =2528760a(7) =46815116a(8) =891483808a(9) =17350187364a(10) =343578992328
External references
- oeis: A379244