a(n) is the constant term in expansion of Product_{k=1..n} (x^k + 1 + 1/x^k)^4.
A369373
a(n) is the constant term in expansion of Product_{k=1..n} (x^k + 1 + 1/x^k)^4.
Terms
- a(0) =1a(1) =19a(2) =701a(3) =33873a(4) =1884211a(5) =113091013a(6) =7138569079a(7) =466998324373
External references
- oeis: A369373