LucasL

LucasL[n] gives the Lucas number Ln.

LucasL[n,x] gives the Lucas polynomial Ln(x).

Examples

Compute the 10th Lucas number:

LucasL[10]
(* 123 *)

Get a Lucas polynomial:

LucasL[4, x]
(* 2 + 4 x^2 + x^4 *)

Please visit the official Wolfram Language Reference for more details.