A143582 - OEIS

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A143582

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

2

1, 3, 20, 56, 576, 1408, 6656, 5120, 278528, 622592, 2752512, 6029312, 52428800, 113246208, 486539264, 1040187392, 11811160064, 15032385536, 317827579904, 223338299392, 5634997092352, 11819749998592, 3298534883328

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..23.

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

Sequence in context: A343010 A360417 A281268 * A132404 A062359 A342672

Adjacent sequences: A143579 A143580 A143581 * A143583 A143584 A143585

KEYWORD

nonn,frac

AUTHOR

Eric W. Weisstein, Aug 24 2008

STATUS

approved