Consider the Post tag system defined in A284116; a(n) = number of binary words of length n which terminate at the empty word.

A289670

Consider the Post tag system defined in A284116; a(n) = number of binary words of length n which terminate at the empty word.

Terms

    a(0) =2a(1) =2a(2) =4a(3) =8a(4) =16a(5) =16a(6) =64a(7) =128a(8) =192a(9) =320a(10) =512a(11) =768a(12) =2560a(13) =6656a(14) =12288a(15) =21504a(16) =36864a(17) =81920a(18) =176128a(19) =327680a(20) =638976a(21) =1392640a(22) =2326528a(23) =4194304a(24) =9568256a(25) =17301504a(26) =30408704a(27) =65536000a(28) =121110528a(29) =220200960

External references