Hexagonal Trefoil Knot

( Maple )

x(t)= -10Cos[t] - 2Cos[5t] + 15Sin[2*t]

y(t)= -15Cos[2t] + 10Sin[t] - 2Sin[5*t]

z(t)= 10Cos[3t]

r(t)= ( x(t),y(t),z(t) )

Animation of similar knot:
http://youtu.be/rChqj_2-7M4