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

A264342

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

Terms

    a(0) =8a(1) =55a(2) =490a(3) =3567a(4) =28925a(5) =223356a(6) =1759250a(7) =13750304a(8) =107777857a(9) =843913133a(10) =6610346674a(11) =51772001513a(12) =405494413096

External references