Extensions 1→N→G→Q→1 with N=D₁₈ and Q=C₄

Direct product G=N×Q with N=D₁₈ and Q=C₄

		d	ρ	Label	ID
C₂×C₄×D₉		72		C2xC4xD9	144,38

Semidirect products G=N:Q with N=D₁₈ and Q=C₄

extension	φ:Q→Out N	d	ρ	Label	ID
D₁₈⋊C₄ = D₁₈⋊C₄	φ: C₄/C₂ → C₂ ⊆ Out D₁₈	72		D18:C4	144,14

Non-split extensions G=N.Q with N=D₁₈ and Q=C₄

extension	φ:Q→Out N	d	ρ	Label	ID
D₁₈.C₄ = C₈⋊D₉	φ: C₄/C₂ → C₂ ⊆ Out D₁₈	72	2	D18.C4	144,6
D₁₈.₂C₄ = C₈×D₉	φ: trivial image	72	2	D18.2C4	144,5

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Extensions 1→N→G→Q→1 with N=D18 and Q=C4