Number of n-digit twin prime pairs.

Terms

a(0) =2a(1) =6a(2) =27a(3) =170a(4) =1019a(5) =6945a(6) =50811a(7) =381332a(8) =2984194a(9) =23988173a(10) =196963369a(11) =1646209172a(12) =13964079652a(13) =119945656793