Number of length-n binary strings s whose longest repeated suffix appears exactly twice in s.

Terms

a(0) =2a(1) =2a(2) =6a(3) =10a(4) =22a(5) =44a(6) =92a(7) =178a(8) =362a(9) =724a(10) =1444a(11) =2888a(12) =5792a(13) =11616a(14) =23300a(15) =46670a(16) =93434a(17) =186988a(18) =374012a(19) =747976a(20) =1495656a(21) =2990440a(22) =5979368a(23) =11956444a(24) =23910164a(25) =47819272a(26) =95645168a(27) =191318496a(28) =382719072a(29) =765644448