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A073584
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Commuting even permutations: number of ordered pairs g, h in the alternating group A_n such that gh = hg.
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2
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1, 1, 9, 48, 300, 2520, 22680, 282240, 3265920, 43545600, 618710400, 10298534400, 171243072000, 3138418483200, 61460695296000, 1286751578112000, 27743619391488000, 640237370572800000, 15448927751921664000, 394130125324615680000, 10422552203028725760000, 288306186674956369920000
(list; graph; refs; listen; history; internal format)
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