One-half of averages of twin prime pairs of A001318.

Terms

a(0) =2a(1) =15a(2) =51a(3) =210a(4) =330a(5) =651a(6) =1365a(7) =1650a(8) =1926a(9) =3480a(10) =5430a(11) =5985a(12) =6501a(13) =11310a(14) =16485a(15) =16590a(16) =21660a(17) =25026a(18) =27270a(19) =28635a(20) =35190a(21) =38001a(22) =39285a(23) =46905a(24) =48690a(25) =58905a(26) =64170a(27) =90651a(28) =109485a(29) =143376