Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns.
A221657
Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns.
Terms
- a(0) =0a(1) =12a(2) =230a(3) =5879a(4) =128076a(5) =2853634a(6) =63318470a(7) =1408047450a(8) =31296772948a(9) =695652396949
External references
- oeis: A221657