Number of length n+6 0..1 arrays with at most two downsteps in every n consecutive neighbor pairs.

Terms

a(0) =128a(1) =256a(2) =512a(3) =1024a(4) =1888a(5) =3204a(6) =5088a(7) =7677a(8) =11120a(9) =15579a(10) =21230a(11) =28264a(12) =36888a(13) =47326a(14) =59820a(15) =74631a(16) =92040a(17) =112349a(18) =135882a(19) =162986a(20) =194032a(21) =229416a(22) =269560a(23) =314913a(24) =365952a(25) =423183a(26) =487142a(27) =558396a(28) =637544a(29) =725218