Number of length n+7 0..1 arrays with at most two downsteps in every n consecutive neighbor pairs.

Terms

a(0) =256a(1) =512a(2) =1024a(3) =2048a(4) =3728a(5) =6192a(6) =9613a(7) =14168a(8) =20075a(9) =27566a(10) =36888a(11) =48304a(12) =62094a(13) =78556a(14) =98007a(15) =120784a(16) =147245a(17) =177770a(18) =212762a(19) =252648a(20) =297880a(21) =348936a(22) =406321a(23) =470568a(24) =542239a(25) =621926a(26) =710252a(27) =807872a(28) =915474a(29) =1033780