Beta, Gamma, factorial and combination functions
BETA(a,b) Beta function
COMBIN(n,k) Combin function
COMBINA(n,k) CombinA function
FACT(x) Factorial function
FACTDOUBLE(x) Double factorial function
LNFACT(x) Logarithm of a factorial function
GAMMA(x) Gamma function
GAMMALN(x) Logarithm of the Gamma function
MULTINOMIAL(a1[,a2, ... , an]) Multinomial function
PERMUT(n,k) Permut function
PERMUTATIONA(n,k) PermutationA function
TERMIAL(x) Termial function