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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)}. 0
1, 3, 10, 103, 727, 2186, 24061, 625691, 625719, 10637349, 202110261, 202110426, 4648540788, 23242705227, 69728116682, 4044230782571, 125371154379821, 125371154410761, 125371154418717, 4638732713568111, 4638732713587491, 190188041257290621, 8178085774065735093 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 5 03:03 EST 2021. Contains 349530 sequences. (Running on oeis4.)