Normal subgroups in a free group of rank 2

Noam K noam144 at netvision.net.il
Sun Nov 25 23:08:12 CET 2001

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Hello,
Sequence A003319 gives the number of subgroups of index n in free group of rank 2 .

What about the number of NORMAL subgroups of index n in free group of rank 2 ?
It appears that this is not in the EIS .
Can someone give the data or a reference ?

Thanks,
Noam K

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