Number of length n+4 0..2 arrays with at most two downsteps in every n consecutive neighbor pairs.

A255626

Number of length n+4 0..2 arrays with at most two downsteps in every n consecutive neighbor pairs.

Terms

    a(0) =243a(1) =729a(2) =2187a(3) =5997a(4) =14381a(5) =30816a(6) =60390a(7) =110270a(8) =190269a(9) =313527a(10) =497322a(11) =764028a(12) =1142238a(13) =1668071a(14) =2386683a(15) =3354003a(16) =4638716a(17) =6324516a(18) =8512653a(19) =11324799a(20) =14906259a(21) =19429554a(22) =25098404a(23) =32152140a(24) =40870575a(25) =51579365a(26) =64655892a(27) =80535702

External references