Extensions 1→N→G→Q→1 with N=C18 and Q=C2

Direct product G=N×Q with N=C18 and Q=C2
dρLabelID
C2×C1836C2xC1836,5

Semidirect products G=N:Q with N=C18 and Q=C2
extensionφ:Q→Aut NdρLabelID
C18⋊C2 = D18φ: C2/C1C2 ⊆ Aut C18182+C18:C236,4

Non-split extensions G=N.Q with N=C18 and Q=C2
extensionφ:Q→Aut NdρLabelID
C18.C2 = Dic9φ: C2/C1C2 ⊆ Aut C18362-C18.C236,1

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