a(n) = 10(n+1)^3*(2n+1)(7n+5)^2.

Terms

a(0) =250a(1) =34560a(2) =487350a(3) =3028480a(4) =12251250a(5) =38016000a(6) =98499310a(7) =223948800a(8) =461143530a(9) =878560000a(10) =1572243750a(11) =2672386560a(12) =4350609250a(13) =6827950080a(14) =10383558750a(15) =15364096000a(16) =22193838810a(17) =31385491200a(18) =43551700630