a(0) = 1, a(n) = 21*n^2 + 2 for n>0.

Terms

a(0) =1a(1) =23a(2) =86a(3) =191a(4) =338a(5) =527a(6) =758a(7) =1031a(8) =1346a(9) =1703a(10) =2102a(11) =2543a(12) =3026a(13) =3551a(14) =4118a(15) =4727a(16) =5378a(17) =6071a(18) =6806a(19) =7583a(20) =8402a(21) =9263a(22) =10166a(23) =11111a(24) =12098a(25) =13127a(26) =14198a(27) =15311a(28) =16466a(29) =17663