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

Terms

a(0) =1a(1) =36a(2) =121a(3) =256a(4) =441a(5) =676a(6) =961a(7) =1296a(8) =1681a(9) =2116a(10) =2601a(11) =3136a(12) =3721a(13) =4356a(14) =5041a(15) =5776a(16) =6561a(17) =7396a(18) =8281a(19) =9216a(20) =10201a(21) =11236a(22) =12321a(23) =13456a(24) =14641a(25) =15876a(26) =17161a(27) =18496a(28) =19881a(29) =21316