a(n) is the reciprocal of the coefficient of x^n in the power series defined by ((1+2x)*exp(x) + 3*exp(-x) - 4)/ (4x^2).
A322544
a(n) is the reciprocal of the coefficient of x^n in the power series defined by ((1+2x)*exp(x) + 3*exp(-x) - 4)/ (4x^2).
Terms
- a(0) =1a(1) =6a(2) =8a(3) =60a(4) =180a(5) =1680a(6) =8064a(7) =90720a(8) =604800a(9) =7983360a(10) =68428800a(11) =1037836800a(12) =10897286400a(13) =186810624000
External references
- oeis: A322544