E.g.f.: sqrt((1+4*x)/(1+2*x)).

A127189

E.g.f.: sqrt((1+4*x)/(1+2*x)).

Terms

    a(0) =1a(1) =1a(2) =-5a(3) =39a(4) =-423a(5) =5985a(6) =-105885a(7) =2269575a(8) =-57475215a(9) =1684565505a(10) =-56176247925

External references