OFFSET
0,2
LINKS
Robert Israel, Table of n, a(n) for n = 0..128
FORMULA
E.g.f. (nonzero coefficients): 2*z/(cosh(z)+cos(z)).
For n >= 1, a(n) = - Sum_{k=0..n-1} a(k)*binomial(4*k+1,4*n+1). - Robert Israel, Jul 04 2016
MAPLE
s := series(2*z/(cosh(z)+cos(z)), z, 60):
seq((4*n+1)!*coeff(s, z, 4*n+1), n=0..11);
MATHEMATICA
c = CoefficientList[Series[1/MittagLefflerE[4, z^4], {z, 0, 15*4}], z];
Table[Factorial[4*n+1]*c[[4*n+1]], {n, 0, 12}]
CROSSREFS
KEYWORD
sign
AUTHOR
Peter Luschny, Jul 03 2016
STATUS
approved