Number of binary sequences of length 2n-1 and curling number 1.

Terms

a(0) =2a(1) =4a(2) =12a(3) =40a(4) =148a(5) =572a(6) =2248a(7) =8920a(8) =35536a(9) =141860a(10) =566880a(11) =2266400a(12) =9063372a(13) =36249044a(14) =144987304a(15) =579931488a(16) =2319690516a(17) =9278691224a(18) =37114623248a(19) =148458209744a(20) =593832272556