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URL: https://oeis.org/A143581

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A143581
Numerators of coefficient of x^(n+1/2) in the series expansion of the haversine.
1
2, 1, 3, 5, 35, 63, 231, 143, 6435, 12155, 46189, 88179, 676039, 1300075, 5014575, 9694845, 100180065, 116680311, 2268783825, 1472719325, 34461632205, 67282234305, 17534158031, 514589420475, 8061900920775, 5267108601573
OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, Inverse Haversine
EXAMPLE
2*sqrt(z) + z^(3/2)/3 + (3*z^(5/2))/20 + (5*z^(7/2))/56 + (35*z^(9/2))/576 + ...
CROSSREFS
Cf. A143582.
Cf. A055786. - R. J. Mathar, Sep 05 2008
Sequence in context: A272891 A219274 A241498 * A096871 A077890 A077877
KEYWORD
nonn,frac
AUTHOR
Eric W. Weisstein, Aug 24 2008
STATUS
approved