OFFSET
2,3
FORMULA
a(n) = A259608(n)/n for n>=1.
EXAMPLE
G.f.: A(x) = x^2 + x^4 + 5*x^6 + 41*x^8 + 438*x^10 + 5564*x^12 + 80237*x^14 +...
where
A'(x)/2 = x + 2*x^3 + 15*x^5 + 164*x^7 + 2190*x^9 + 33384*x^11 + 561659*x^13 + 10226376*x^15 +...+ A259608(n)*x^(2*n-1) +...
PROG
(PARI) {a(n)=local(A=x); for(i=0, n, A = serreverse(x - x^2*A - x*intformal(2*A) +x*O(x^(2*n)))); polcoeff(A, 2*n-1)/n}
for(n=1, 25, print1(a(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jul 01 2015
STATUS
approved