function correction( k ) {
	var v;
	switch ( k ) {
	case 0:
		return 0.08106146679532726;
	case 1:
		return 0.04134069595540929;
	case 2:
		return 0.02767792568499834;
	case 3:
		return 0.02079067210376509;
	case 4:
		return 0.01664469118982119;
	case 5:
		return 0.01387612882307075;
	case 6:
		return 0.01189670994589177;
	case 7:
		return 0.01041126526197209;
	case 8:
		return 0.009255462182712733;
	case 9:
		return 0.008330563433362871;
	default:
		k += 1;
		v = pow( k, 2 );
		return (ONE_12 - ((ONE_360 - (ONE_1260/v)) / v)) / k;
	}
}
Returns a correction for Stirling's approximation.

@private
@param {NonNegativeInteger} k - input argument
@returns {number} correction term

@example
var c = correction( 0 );
// returns 0.08106146679532726