SixJSymbol

SixJSymbol[{j1, j2, j3}, {j4, j5, j6}] gives the values of the Wigner 6-j symbol.

Examples

SixJSymbol[{1, 1, 1}, {1, 1, 1}]
(* 1/6 *)

SixJSymbol[{2, 2, 2}, {2, 2, 2}]
(* 1/14 *)

Please visit the official Wolfram Language Reference for more details.