Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two.
A221414
Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two.
Terms
- a(0) =0a(1) =10a(2) =0a(3) =150a(4) =0a(5) =2250a(6) =0a(7) =33750a(8) =0a(9) =506250a(10) =0a(11) =7593750a(12) =0a(13) =113906250a(14) =0a(15) =1708593750a(16) =0a(17) =25628906250a(18) =0a(19) =384433593750a(20) =0a(22) =0a(24) =0a(26) =0a(28) =0a(30) =0
External references
- oeis: A221414