a(n) = Sum_{k=0..floor(n/2)} lcm(1,...,2*(n-k)+2)/lcm(1,...,2*k+2).
A120107
a(n) = Sum_{k=0..floor(n/2)} lcm(1,...,2*(n-k)+2)/lcm(1,...,2*k+2).
Terms
- a(0) =1a(1) =6a(2) =31a(3) =425a(4) =1331a(5) =14084a(6) =182533a(7) =390855a(8) =6192220a(9) =117429752a(10) =136000866a(11) =2700408581a(12) =13835919839a(13) =42477252404
External references
- oeis: A120107