Extensions 1→N→G→Q→1 with N=C₂₀ and Q=C₁₈

Direct product G=N×Q with N=C₂₀ and Q=C₁₈

		d	ρ	Label	ID
C₂×C₁₈₀		360		C2xC180	360,30

Semidirect products G=N:Q with N=C₂₀ and Q=C₁₈

extension	φ:Q→Aut N	d	ρ	Label	ID
C₂₀⋊₁C₁₈ = C₉×D₂₀	φ: C₁₈/C₉ → C₂ ⊆ Aut C₂₀	180	2	C20:1C18	360,17
C₂₀⋊₂C₁₈ = D₅×C₃₆	φ: C₁₈/C₉ → C₂ ⊆ Aut C₂₀	180	2	C20:2C18	360,16
C₂₀⋊₃C₁₈ = D₄×C₄₅	φ: C₁₈/C₉ → C₂ ⊆ Aut C₂₀	180	2	C20:3C18	360,31

Non-split extensions G=N.Q with N=C₂₀ and Q=C₁₈

extension	φ:Q→Aut N	d	ρ	Label	ID
C₂₀.₁C₁₈ = C₉×Dic₁₀	φ: C₁₈/C₉ → C₂ ⊆ Aut C₂₀	360	2	C20.1C18	360,15
C₂₀.₂C₁₈ = C₉×C₅⋊₂C₈	φ: C₁₈/C₉ → C₂ ⊆ Aut C₂₀	360	2	C20.2C18	360,2
C₂₀.₃C₁₈ = Q₈×C₄₅	φ: C₁₈/C₉ → C₂ ⊆ Aut C₂₀	360	2	C20.3C18	360,32

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Extensions 1→N→G→Q→1 with N=C20 and Q=C18