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A053465
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Number of connected 2-multigraphs on n nodes.
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1
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1, 2, 7, 53, 712, 24576, 2275616, 589543159, 420188096140, 819411181635025, 4381819315336997184, 64583749250393921183423, 2638507778912832094660037006, 300397569392490080058575760090548
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