a(n) = Product_{1<=i<=j<=n} (i+j+n-1)/(i+j-1), number of symmetric plane partitions in n-cube.
A049505
a(n) = Product_{1<=i<=j<=n} (i+j+n-1)/(i+j-1), number of symmetric plane partitions in n-cube.
Terms
- a(0) =1a(1) =2a(2) =10a(3) =112a(4) =2772a(5) =151008a(6) =18076916a(7) =4751252480
External references
- oeis: A049505