Number of (2n) X (2+1) arrays of permutations of 0..n*6-1 with each element having directed index change -1,0 0,2 -1,-2 or 1,0.

A264514

Number of (2n) X (2+1) arrays of permutations of 0..n*6-1 with each element having directed index change -1,0 0,2 -1,-2 or 1,0.

Terms

    a(0) =1a(1) =3a(2) =12a(3) =46a(4) =177a(5) =684a(6) =2640a(7) =10180a(8) =39249a(9) =151326a(10) =583444a(11) =2249491a(12) =8673001a(13) =33439105a(14) =128925825a(15) =497078745a(16) =1916507251a(17) =7389171396a(18) =28489249854a(19) =109841457681a(20) =423498192724

External references