a(n) is the constant term in expansion of Product_{k=1..n} (x^k + 1 + 1/x^k)^3.
A369372
a(n) is the constant term in expansion of Product_{k=1..n} (x^k + 1 + 1/x^k)^3.
Terms
- a(0) =1a(1) =7a(2) =85a(3) =1437a(4) =26707a(5) =534513a(6) =11255951a(7) =245612031a(8) =5503639327a(9) =125900330437
External references
- oeis: A369372