a(n) = coefficient of x^(2*n)/(2*n)! in the expansion of the even function C(x) = sqrt(1 + S(x)^2) where S(x) is defined by A357230.
A357231
a(n) = coefficient of x^(2*n)/(2*n)! in the expansion of the even function C(x) = sqrt(1 + S(x)^2) where S(x) is defined by A357230.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =109a(4) =8689a(5) =1053481a(6) =243813361a(7) =75186825109
External references
- oeis: A357231