OFFSET
0,2
FORMULA
a(2*n - 3) = 1 for n >= 3.
2 divides a(2*n) for n >= 1.
MAPLE
gf := z*(exp(z)+2*exp(-(1/2)*z)*cos((1/2)*z*sqrt(3)))/(1-exp(-z));
ser := series(gf, z, 70): seq(denom(n!*coeff(ser, z, n)), n=0..63);
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Peter Luschny, Aug 19 2018
STATUS
approved