Knot[10, 21] -> {20787.448828, {490 + 9/t^12 - 62/t^10 + 177/t^8 - 308/t^6 + 
    409/t^4 - 470/t^2 - 470*t^2 + 409*t^4 - 308*t^6 + 177*t^8 - 62*t^10 + 
    9*t^12, 385437 + 23/t^24 - 314/t^22 + 1944/t^20 - 7344/t^18 + 
    19412/t^16 - 39098/t^14 + 64460/t^12 - 94665/t^10 + 135849/t^8 - 
    197942/t^6 + 279190/t^4 - 354233/t^2 - 354233*t^2 + 279190*t^4 - 
    197942*t^6 + 135849*t^8 - 94665*t^10 + 64460*t^12 - 39098*t^14 + 
    19412*t^16 - 7344*t^18 + 1944*t^20 - 314*t^22 + 23*t^24}}
