G.f.: A(x) = Product_{n>=1} [ (1-x)^5*(1 + 5x + 15x^2 +...+ n(n+1)(n+2)(n+3)/4!*x^(n-1)) ].

A129358

G.f.: A(x) = Product_{n>=1} [ (1-x)^5*(1 + 5x + 15x^2 +...+ n(n+1)(n+2)(n+3)/4!*x^(n-1)) ].

Terms

    a(0) =1a(1) =-5a(2) =-5a(3) =70a(4) =-180a(5) =770a(6) =-4760a(7) =20840a(8) =-68085a(9) =147890a(10) =-795a(11) =-1679855a(12) =8378195a(13) =-25065005a(14) =56439545a(15) =-145200415a(16) =612604910a(17) =-2764023765a(18) =10020060660a(19) =-28723695265a(20) =67618167310a(21) =-128945409045a(22) =137921330680a(23) =375948665405

External references