BESSELI gives wrong answer for some inputs

[ArniDagur]

Examples

Excel Formula	Excel Answer	SheetJS Answer
=BESSELI(-13.2,3)	-42092.84027	-25425.470523920318
=BESSELI(-13.8,9)	-5663.903109	-3037.8756236089935
=BESSELI(-10.08,2)	2465.760003	2215.9970659564715
=BESSELI(-11.06,0)	7717.636762	6363.659791792667
=BESSELI(-9.86,4)	1061.120531	967.9812913086927
=BESSELI(-12.81,7)	-5926.01108	-3838.353089311662
=BESSELI(-13.07,6)	12963.19511	8019.79800362882
=BESSELI(-14.37,7)	-32766.94859	-15501.267818797078
=BESSELI(-9.02,2)	881.4361669	840.1405514233114
=BESSELI(-13.3,16)	8.029039773	4.759261926315784
=BESSELI(-13.2,0)	59922.88267	36195.423498210446
=BESSELI(-10.21,5)	-974.2341176	-867.2309455734216
=BESSELI(-11.4,3)	-7078.122098	-5619.615638800571
=BESSELI(-10.09,4)	1346.003156	1208.798299218855
=BESSELI(-10.78,11)	-26.13731414	-22.163938968958945
=BESSELI(-9.41,11)	-3.543708301	-3.3176964175025487
=BESSELI(-11.59,0)	12801.13745	9932.122603521633

When I ask scipy.special.iv, it agrees with Excel on the answer. When using that function, watch out for the arguments being switched—(n,x) rather than (x,n).

It should be noted I didn't find any bugs like this in BESSELJ, BESSELY, or BESSELK.