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

A264273

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

Terms

    a(0) =9a(1) =48a(2) =256a(3) =1280a(4) =6400a(5) =32000a(6) =160000a(7) =800000a(8) =4000000a(9) =20000000a(10) =100000000a(11) =500000000a(12) =2500000000a(13) =12500000000a(14) =62500000000a(15) =312500000000

External references