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C
n
D
n
S
n
A
n
Degree
Linear
Irr Reps
Characters
×
⋊
.
○
≀
Extensions
1→N→G→Q→1 with N=
C
9
2
and Q=
C
2
Direct product G=N×Q with N=
C
9
2
and Q=
C
2
d
ρ
Label
ID
C
9
×C
18
162
C9xC18
162,23
Semidirect products G=N:Q with N=
C
9
2
and Q=
C
2
extension
φ:Q→Aut N
d
ρ
Label
ID
C
9
2
⋊
1
C
2
=
C
9
×D
9
φ:
C
2
/
C
1
→
C
2
⊆ Aut
C
9
2
18
2
C9^2:1C2
162,3
C
9
2
⋊
2
C
2
=
C
9
⋊D
9
φ:
C
2
/
C
1
→
C
2
⊆ Aut
C
9
2
81
C9^2:2C2
162,16
×
⋊
ℤ
𝔽
○
≀
ℚ
◁