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

A264112

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

Terms

    a(0) =4a(1) =40a(2) =441a(3) =2745a(4) =21025a(5) =167464a(6) =1336336a(7) =10277652a(8) =80568576a(9) =631845004a(10) =4952218384a(11) =38731564472a(12) =303450044769

External references