OFFSET
1,2
EXAMPLE
E.g.f.: A(x) = x + 3*x^3/3! + 70*x^5/5! + 4620*x^7/7! + 599256*x^9/9! + 128648520*x^11/11! + 41281606080*x^13/13! + 18507916627200*x^15/15! +...
such that
Series_Reversion(A(x)) = x - x^3/(1*2) + x^5/(2*3) - x^7/(3*4) + x^9/(4*5) - x^11/(5*6) + x^13/(6*7) +...+ (-1)^(n-1)*x^(2*n-1)/(n*(n-1)) +...
PROG
(PARI) {a(n) = (2*n-1)! * polcoeff( serreverse(x - sum(m=2, n, (-1)^m * x^(2*m-1) / (m*(m-1)) ) +O(x^(2*n+2))), 2*n-1)}
for(n=1, 25, print1(a(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Nov 17 2016
STATUS
approved