A143581 - OEIS

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A143581

Numerators of coefficient of x^(n+1/2) in the series expansion of the haversine.

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..26.

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

Adjacent sequences: A143578 A143579 A143580 * A143582 A143583 A143584

KEYWORD

nonn,frac

AUTHOR

Eric W. Weisstein, Aug 24 2008

STATUS

approved