p*B_(p-1)+1 modulo p^2, where p = prime(n) and B_i denotes the i-th Bernoulli number.

Terms

a(0) =0a(1) =6a(2) =5a(3) =42a(4) =22a(5) =13a(6) =102a(7) =57a(8) =207a(9) =551a(10) =620a(11) =296a(12) =697a(13) =602a(14) =329a(15) =1855a(16) =1652a(17) =3477a(18) =871a(19) =4970a(20) =876a(21) =5846a(22) =1743a(23) =6319a(24) =6887a(25) =7373a(26) =5974a(27) =214a(28) =3379a(29) =10848