Number of nX2 arrays of permutations of 0..n*2-1 with each element moved a city block distance of 0 or 3.

A263440

Number of nX2 arrays of permutations of 0..n*2-1 with each element moved a city block distance of 0 or 3.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =25a(4) =125a(5) =633a(6) =2532a(7) =10288a(8) =48776a(9) =233776a(10) =1080228a(11) =4996113a(12) =23080949a(13) =107157345a(14) =501507348a(15) =2345998289a(16) =10947914825a(17) =51111745065a(18) =238823109920

External references