Number of length n+2 0..3 arrays with at most two downsteps in every n consecutive neighbor pairs.

A255662

Number of length n+2 0..3 arrays with at most two downsteps in every n consecutive neighbor pairs.

Terms

    a(0) =64a(1) =256a(2) =1016a(3) =3692a(4) =11752a(5) =33042a(6) =83752a(7) =195020a(8) =423460a(9) =867347a(10) =1690744a(11) =3158528a(12) =5686080a(13) =9908365a(14) =16774260a(15) =27673310a(16) =44603624a(17) =70391386a(18) =108974472a(19) =165764956a(20) =248107880a(21) =365856580a(22) =532088128a(23) =763986096a(24) =1083921900a(25) =1520770469

External references