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

Terms

a(0) =9a(1) =64a(2) =169a(3) =324a(4) =529a(5) =784a(6) =1089a(7) =1444a(8) =1849a(9) =2304a(10) =2809a(11) =3364a(12) =3969a(13) =4624a(14) =5329a(15) =6084a(16) =6889a(17) =7744a(18) =8649a(19) =9604a(20) =10609a(21) =11664a(22) =12769a(23) =13924a(24) =15129a(25) =16384a(26) =17689a(27) =19044a(28) =20449a(29) =21904