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A019988
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Number of ways of embedding a connected graph with n edges in the square lattice.
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4
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1, 2, 5, 16, 55, 222, 950, 4265, 19591, 91678, 434005, 2073783, 9979772, 48315186, 235088794, 1148891118, 5636168859
(list; graph; refs; listen; history; internal format)
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