Number of bitstrings of length n (with at least two runs) where the last two runs have different lengths.

A208901

Number of bitstrings of length n (with at least two runs) where the last two runs have different lengths.

Terms

    a(0) =0a(1) =0a(2) =4a(3) =8a(4) =24a(5) =48a(6) =112a(7) =224a(8) =480a(9) =960a(10) =1984a(11) =3968a(12) =8064a(13) =16128a(14) =32512a(15) =65024a(16) =130560a(17) =261120a(18) =523264a(19) =1046528a(20) =2095104a(21) =4190208a(22) =8384512a(23) =16769024a(24) =33546240a(25) =67092480a(26) =134201344a(27) =268402688a(28) =536838144a(29) =1073676288

External references