Number of (n+1)X(2+1) arrays of permutations of 0..n*3+2 with each element having index change +-(.,.) 0,0 0,2 or 2,1.

A264191

Number of (n+1)X(2+1) arrays of permutations of 0..n*3+2 with each element having index change +-(.,.) 0,0 0,2 or 2,1.

Terms

    a(0) =4a(1) =18a(2) =81a(3) =360a(4) =1600a(5) =6760a(6) =28561a(7) =120666a(8) =509796a(9) =2159850a(10) =9150625a(11) =38768400a(12) =164249856a(13) =695767824a(14) =2947295521a(15) =12484841330a(16) =52886200900a(17) =224029644930a(18) =949005240561

External references