a(n) = (p^2 - p + 2)/2 for p = prime(n); number of squares modulo p^2.

Terms

a(0) =2a(1) =4a(2) =11a(3) =22a(4) =56a(5) =79a(6) =137a(7) =172a(8) =254a(9) =407a(10) =466a(11) =667a(12) =821a(13) =904a(14) =1082a(15) =1379a(16) =1712a(17) =1831a(18) =2212a(19) =2486a(20) =2629a(21) =3082a(22) =3404a(23) =3917a(24) =4657a(25) =5051a(26) =5254a(27) =5672a(28) =5887a(29) =6329