LegendreP

See

Legendre Polynomial

Related Wolfram sites

https://functions.wolfram.com/Polynomials/LegendreP/, https://functions.wolfram.com/Polynomials/LegendreP2/, https://functions.wolfram.com/HypergeometricFunctions/LegendrePGeneral/, https://functions.wolfram.com/HypergeometricFunctions/LegendreP2General/, https://functions.wolfram.com/HypergeometricFunctions/LegendreP3General/