OFFSET
0,1
FORMULA
a(2*n - 3) = 2*n - 3 for n >= 3.
EXAMPLE
Rational values start: 3, 3/2, 1/2, 3, 59/10, 5, 43/14, 7, 139/10, 9, -127/22, 11, 62099/910, 13, -2513/10, 15, 278923/170, 17, ....
MAPLE
gf := z*(exp(z)+2*exp(-(1/2)*z)*cos((1/2)*z*sqrt(3)))/(1-exp(-z));
ser := series(gf, z, 100): seq(numer(n!*coeff(ser, z, n)), n=0..36);
CROSSREFS
KEYWORD
sign,frac
AUTHOR
Peter Luschny, Aug 19 2018
STATUS
approved