E.g.f. (1-x)/(1-x-2x^3).

A052601

E.g.f. (1-x)/(1-x-2x^3).

Terms

    a(0) =1a(1) =0a(2) =0a(3) =12a(4) =48a(5) =240a(6) =4320a(7) =50400a(8) =564480a(9) =9434880a(10) =166924800a(11) =2953843200a(12) =60354201600

External references