Expansion of e.g.f.: sec(log(x+1)*log(x+1)) = 1 + (12/4!)*x^4 - (120/5!)*x^5 + (1020/6!)*x^6 ...

A012273

Expansion of e.g.f.: sec(log(x+1)*log(x+1)) = 1 + (12/4!)*x^4 - (120/5!)*x^5 + (1020/6!)*x^6 ...

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =12a(5) =-120a(6) =1020a(7) =-8820a(8) =89628a(9) =-1109808a(10) =15992160a(11) =-253374000a(12) =4306032192a(13) =-78317306496

External references