A143582 Denominators of coefficient of x^(n+1/2) in the series expansion of the haversine.

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

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

Cf. A143581.

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