a(n) = ((p-1)^n + (p+1)^n) mod p^2, where p is the n-th prime.

Terms

a(0) =0a(1) =2a(2) =5a(3) =2a(4) =110a(5) =2a(6) =238a(7) =2a(8) =414a(9) =2a(10) =682a(11) =2a(12) =1066a(13) =2a(14) =1410a(15) =2a(16) =2006a(17) =2a(18) =2546a(19) =2a(20) =3066a(21) =2a(22) =3818a(23) =2a(24) =4850a(25) =2a(26) =5562a(27) =2a(28) =6322a(29) =2