FUNCTION :  _etan -  symbolic form eta(n*tau)

CALLING SEQUENCE :  _etan(n)                                                
                    

PARAMETERS :      n  - positive integer

SYNOPSIS :  _etanm(n,m) returns eta(n*tau)

EXAMPLES :   

> with(thetaids):
> _etan(5);
                                  eta(5 tau)

SEE ALSO :  

_ETAnm, _ETAn, _etanm