OFFSET
0,1
FORMULA
Conjecture: a(n) = 2*A306254(n)/(4^(n+1)).
EXAMPLE
f^-1(x) = (1/2)*x + (1/96)*x^3 + (1/1920)*x^5 + (43/1290240)*x^7 + ...
PROG
(PARI) a(n) = denominator(polcoef(serreverse(sin(x + O(x^(2*n))) + x), 2*n-1)) \\ Andrew Howroyd, Apr 18 2023
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Billy Bolton, Apr 18 2023
STATUS
approved