Squarefree kernel of (prime(n)+1)*(prime(n+1)+1)/4.

Terms

a(0) =3a(1) =6a(2) =6a(3) =6a(4) =42a(5) =21a(6) =30a(7) =30a(8) =30a(9) =30a(10) =38a(11) =399a(12) =462a(13) =66a(14) =6a(15) =30a(16) =930a(17) =1054a(18) =102a(19) =222a(20) =370a(21) =210a(22) =210a(23) =105a(24) =357a(25) =1326a(26) =78a(27) =330a(28) =3135a(29) =114