First sums of successive twin primes of order n.

Terms

a(0) =8a(1) =18a(2) =40a(3) =92a(4) =216a(5) =508a(6) =1184a(7) =2730a(8) =6244a(9) =14210a(10) =32232a(11) =72886a(12) =164228a(13) =368508a(14) =823168a(15) =1830254a(16) =4050492a(17) =8922736a(18) =19567376a(19) =42726960a(20) =92925664a(21) =201364874a(22) =434900208a(23) =936411160a(24) =2010419024a(25) =4304117640a(26) =9189045664a(27) =19563691880