JacobiP[n,1,2,5].

Terms

a(0) =1a(1) =12a(2) =123a(3) =1208a(4) =11685a(5) =112380a(6) =1078735a(7) =10352592a(8) =99411561a(9) =955512620a(10) =9194193987a(11) =88570160904a(12) =854185695181