G.f.: exp( Sum_{n>=1} A084605(n)^2 * x^n/n ), where A084605(n) is the central coefficient in (1 + x + 4*x^2)^n.
A322241
G.f.: exp( Sum_{n>=1} A084605(n)^2 * x^n/n ), where A084605(n) is the central coefficient in (1 + x + 4*x^2)^n.
Terms
- a(0) =1a(1) =1a(2) =41a(3) =249a(4) =6305a(5) =77569a(6) =1665321a(7) =27724889a(8) =574252417a(9) =10958980929a(10) =228679916905
External references
- oeis: A322241