Number of tilings by lozenges of hexagon with sides n, n+1, n, n+1, n, n+1 and central triangle removed.
A069788
Number of tilings by lozenges of hexagon with sides n, n+1, n, n+1, n, n+1 and central triangle removed.
Terms
- a(0) =2a(1) =54a(2) =4320a(3) =2500000a(4) =5252187500
External references
- oeis: A069788