A general set of relations involving 3-j symbols
H. E. De Meyer, Guido Vanden Berghe · Journal of Physics A Mathematical and General · 1978
It is shown that the sums involving squares of particular 3-j symbols, can be expressed in terms of gamma functions and higher transcendentals for complex k i and for any natural number n. Simplified formulae are derived for integral and half-integral k i values.