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A338213
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a(n) is the number of free polyominoes with sprawl n.
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3
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1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 3, 2, 4, 6, 13, 15, 30, 50, 93, 158, 287, 513, 950, 1735, 3212, 5945, 11099, 20720, 38910, 73002, 137821, 259757
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