Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two.
A221421
Number of 3Xn 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) =8a(2) =0a(3) =226a(4) =0a(5) =6798a(6) =0a(7) =198823a(8) =0a(9) =5789134a(10) =0a(11) =168353683a(12) =0a(13) =4894400220a(14) =0a(15) =142279944512a(16) =0a(18) =0a(20) =0a(22) =0a(24) =0a(26) =0a(28) =0
External references
- oeis: A221421