Constant term in the expansion of (-1 + Product_{k=1..n} (1 + x_k + 1/x_k))^n.
A326920
Constant term in the expansion of (-1 + Product_{k=1..n} (1 + x_k + 1/x_k))^n.
Terms
- a(0) =1a(1) =0a(2) =8a(3) =264a(4) =121200a(5) =332810400
External references
- oeis: A326920