Coefficients of Legendre polynomials.

Terms

a(0) =1a(1) =3a(2) =20a(3) =35a(4) =126a(5) =231a(6) =3432a(7) =6435a(8) =24310a(9) =46189a(10) =352716a(11) =676039a(12) =2600150a(13) =5014575a(14) =155117520a(15) =300540195a(16) =1166803110a(17) =2268783825a(18) =17672631900a(19) =34461632205a(20) =134564468610a(21) =263012370465