a(n) = n*(2*n^2 + 3), n >= 1; a(0)=1.

Terms

a(0) =1a(1) =5a(2) =22a(3) =63a(4) =140a(5) =265a(6) =450a(7) =707a(8) =1048a(9) =1485a(10) =2030a(11) =2695a(12) =3492a(13) =4433a(14) =5530a(15) =6795a(16) =8240a(17) =9877a(18) =11718a(19) =13775a(20) =16060a(21) =18585a(22) =21362a(23) =24403a(24) =27720a(25) =31325a(26) =35230a(27) =39447a(28) =43988a(29) =48865