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

Offset: 1

Author

Eric W. Weisstein, Aug 24 2008

Keywords

• nonn
• frac

Examples

			2*sqrt(z) + z^(3/2)/3 + (3*z^(5/2))/20 + (5*z^(7/2))/56 + (35*z^(9/2))/576 + ...
		

Links

• Eric Weisstein's World of Mathematics, Inverse Haversine

Crossrefs

Cf. A143582.

Cf. A055786. - R. J. Mathar, Sep 05 2008