G.f. satisfies: A(x) = G(x/A(x)^2) and G(x) = A(x*G(x)^2) = Sum_{n>=0} C(2n,n)*C(2n+2,n+1)/(n+2)*x^n is the g.f. of A172392.
A172393
G.f. satisfies: A(x) = G(x/A(x)^2) and G(x) = A(x*G(x)^2) = Sum_{n>=0} C(2n,n)*C(2n+2,n+1)/(n+2)*x^n is the g.f. of A172392.
Terms
- a(0) =1a(1) =4a(2) =-2a(3) =8a(4) =-20a(5) =96a(6) =-324a(7) =1648a(8) =-6348a(9) =33200a(10) =-137848a(11) =732640a(12) =-3193296a(13) =17148608a(14) =-77335400a(15) =418289696a(16) =-1934677436a(17) =10518803376a(18) =-49611450120a(19) =270796872160
External references
- oeis: A172393