Number of n X 2 arrays of permutations of 0..n*2-1 with each element moved a city block distance of 0 or 2.
A263420
Number of n X 2 arrays of permutations of 0..n*2-1 with each element moved a city block distance of 0 or 2.
Terms
- a(0) =1a(1) =4a(2) =36a(3) =196a(4) =961a(5) =5329a(6) =29584a(7) =160000a(8) =868624a(9) =4739329a(10) =25816561a(11) =140517316a(12) =765186244a(13) =4167218916a(14) =22692108321a(15) =123567013441a(16) =672885527616
External references
- oeis: A263420