a(n) = (p^2 - 1) / 12, where p is the n-th prime of the form 4*k+1.

Terms

a(0) =2a(1) =14a(2) =24a(3) =70a(4) =114a(5) =140a(6) =234a(7) =310a(8) =444a(9) =660a(10) =784a(11) =850a(12) =990a(13) =1064a(14) =1564a(15) =1850a(16) =2054a(17) =2494a(18) =2730a(19) =3104a(20) =3234a(21) =4370a(22) =4524a(23) =4840a(24) =5504a(25) =6030a(26) =6394a(27) =6580a(28) =7154a(29) =8164