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

A264122

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

Terms

    a(0) =2a(1) =9a(2) =45a(3) =200a(4) =845a(5) =3549a(6) =14994a(7) =63525a(8) =269225a(9) =1140624a(10) =4831721a(11) =20466953a(12) =86698690a(13) =367261713a(14) =1555747893a(15) =6590256856a(16) =27916775317a(17) =118257348165a(18) =500946152850

External references