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A053468
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Number of directed 3-multigraphs on n nodes.
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2
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1, 10, 720, 703760, 9168331776, 1601371799340544, 3837878966366932639744, 128777257564337108286016980992, 61454877497308462618188532330410573824, 422314689395950135433730499958070655419345928192
(list; graph; refs; listen; history; internal format)
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