A025553 a(n) = (Sum_{i=0..n-1} 1/b(i)) * LCM{b(i): i=0..n-1}, where b(i) = C(i,floor(i/2)).

1, 2, 5, 17, 18, 93, 189, 1335, 1341, 4033, 4038, 44448, 44463, 578124, 1156353, 1156409, 1156437, 19659681, 19659807, 373537593, 373538223, 373538553, 373538718, 8591392494, 8591393484, 42956969994, 42956971281, 128870915845, 128870916846

Offset

1,2

Links

Table of n, a(n) for n=1..29.

Crossrefs

Sequence in context: A123364 A247857 A367784 * A343775 A075544 A104247

Adjacent sequences: A025550 A025551 A025552 * A025554 A025555 A025556

Keyword

nonn

Author

Clark Kimberling

Extensions

Title corrected by Sean A. Irvine, Sep 05 2019

Status

approved