Dear Colleague,

Of course, the size of higher dihedral group must be larger.

But :
gap> d2 := DihedralGroup(2); Size(d2);
Group( (1,2), (3,4) )
4

gap> d4 := DihedralGroup(4); Size(d4);
Group( (1,2) )
2
Is here a bug ?

Yours, R.M.