je'e'e VUhU experimental cmavo

mekso operator: associated Legendre polynomial in a with unassociated order b and associated order c

b is a nonnegative integer; c is an integer. Lacks the Condon-Shortley phase. Normalized with Pn(1)=1 (outputs 1 for a=1, c=0, for any b in the domain set; this function is notably not normalized for integrations).