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

A264085

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

Terms

    a(0) =9a(1) =39a(2) =169a(3) =715a(4) =3025a(5) =12815a(6) =54289a(7) =229971a(8) =974169a(9) =4126647a(10) =17480761a(11) =74049691a(12) =313679521a(13) =1328767775a(14) =5628750625a(15) =23843770275a(16) =101003831721a(17) =427859097159

External references