A025541 a(n) = (1/C(0,0) + 1/C(2,1) + ... + 1/C(2n,n))*L, where L = LCM{C(0,0), C(2,1),..., C(2n,n)}.

1, 3, 10, 103, 727, 2186, 24061, 625691, 625719, 10637349, 202110261, 202110426, 4648540788, 23242705227, 69728116682, 4044230782571, 125371154379821, 125371154410761, 125371154418717, 4638732713568111, 4638732713587491, 190188041257290621, 8178085774065735093

Offset

0,2

Links

Table of n, a(n) for n=0..22.

Maple

a:= n-> (l-> add(1/j, j=l)*ilcm(l[]))([seq(binomial(2*i, i), i=0..n)]):
seq(a(n), n=0..22);  # Alois P. Heinz, Sep 04 2019

Crossrefs

Cf. A000984.

Sequence in context: A260813 A062013 A023372 * A203903 A173325 A233257

Adjacent sequences: A025538 A025539 A025540 * A025542 A025543 A025544

Keyword

nonn

Author

Clark Kimberling

Extensions

a(7) corrected by Sean A. Irvine, Sep 04 2019

Status

approved