Generalized Catalan numbers C(-5; n).

A064327

Generalized Catalan numbers C(-5; n).

Terms

    a(0) =1a(1) =1a(2) =-4a(3) =41a(4) =-514a(5) =7206a(6) =-108174a(7) =1700721a(8) =-27646234a(9) =460887086a(10) =-7836596944a(11) =135380098426

External references