E.g.f. satisfies: A(x) = x*(sec(exp(A(x))-1)).
A133553
E.g.f. satisfies: A(x) = x*(sec(exp(A(x))-1)).
Terms
- a(0) =0a(1) =1a(2) =0a(3) =3a(4) =12a(5) =120a(6) =1290a(7) =17409a(8) =277592a(9) =5083659a(10) =105675030a(11) =2452220144a(12) =62891640900
External references
- oeis: A133553