a(n) is the constant term in the expansion of Product_{k=1..n} (x^k + 1 + 1/x^k)^n.
A350305
a(n) is the constant term in the expansion of Product_{k=1..n} (x^k + 1 + 1/x^k)^n.
Terms
- a(0) =1a(1) =1a(2) =13a(3) =1437a(4) =1884211a(5) =24657701475
External references
- oeis: A350305