Constant term in the expansion of (-2 + Product_{k=1..n} (1 + x_k) + Product_{k=1..n} (1 + 1/x_k))^n.
A328814
Constant term in the expansion of (-2 + Product_{k=1..n} (1 + x_k) + Product_{k=1..n} (1 + 1/x_k))^n.
Terms
- a(0) =1a(1) =0a(2) =6a(3) =72a(4) =6690a(5) =1536000a(6) =1398496680
External references
- oeis: A328814