Number of arrays of the median of three adjacent elements of some length -(n+2) 0..3 array.

A228735

Number of arrays of the median of three adjacent elements of some length -(n+2) 0..3 array.

Terms

    a(0) =4a(1) =16a(2) =64a(3) =232a(4) =696a(5) =2072a(6) =6130a(7) =18378a(8) =55716a(9) =169734a(10) =517764a(11) =1578184a(12) =4806344a(13) =14629384a(14) =44519552a(15) =135480532a(16) =412314438a(17) =1254882280a(18) =3819338704a(19) =11624541548a(20) =35380360780a(21) =107682931160a(22) =327740673246a(23) =997501106370

External references