Number of elements in the continued fraction for Sum_{k=0..n} 1/2^2^k.

Terms

a(0) =2a(1) =3a(2) =4a(3) =6a(4) =10a(5) =18a(6) =34a(7) =66a(8) =130a(9) =258a(10) =514a(11) =1026a(12) =2050a(13) =4098a(14) =8194a(15) =16386a(16) =32770a(17) =65538a(18) =131074a(19) =262146a(20) =524290a(21) =1048578a(22) =2097154a(23) =4194306a(24) =8388610a(25) =16777218a(26) =33554434a(27) =67108866a(28) =134217730a(29) =268435458