a(n) = Sum_{k=0..n} lcm(1..2n+2)/lcm(1..2k+2).
A120106
a(n) = Sum_{k=0..n} lcm(1..2n+2)/lcm(1..2k+2).
Terms
- a(0) =1a(1) =7a(2) =36a(3) =505a(4) =1516a(5) =16677a(6) =216802a(7) =433605a(8) =7371286a(9) =140054435a(10) =140054436a(11) =3221252029a(12) =16106260146a(13) =48318780439
External references
- oeis: A120106