a(n) = 1521*n^2 + 39.

Terms

a(0) =39a(1) =1560a(2) =6123a(3) =13728a(4) =24375a(5) =38064a(6) =54795a(7) =74568a(8) =97383a(9) =123240a(10) =152139a(11) =184080a(12) =219063a(13) =257088a(14) =298155a(15) =342264a(16) =389415a(17) =439608a(18) =492843a(19) =549120a(20) =608439a(21) =670800a(22) =736203a(23) =804648a(24) =876135a(25) =950664a(26) =1028235a(27) =1108848a(28) =1192503a(29) =1279200