a(n) is the sum of quadratic nonresidues of A002145(n) (the n-th prime == 3 mod 4).

Terms

a(0) =2a(1) =14a(2) =33a(3) =95a(4) =161a(5) =279a(6) =473a(7) =658a(8) =944a(9) =1139a(10) =1491a(11) =1738a(12) =1826a(13) =2884a(14) =2996a(15) =4318a(16) =4585a(17) =5004a(18) =6191a(19) =6683a(20) =7849a(21) =8413a(22) =10314a(23) =10746a(24) =11394a(25) =13157a(26) =13393a(27) =16013a(28) =16566a(29) =18936