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A220828
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Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [4].
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2
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4, 10, 20, 55, 220, 1040, 5480, 31420, 190360, 1202930, 7848720, 52543935, 359182620, 2498614620, 17640615900, 126142316865, 912047139460, 6658803466730, 49035674140240, 363881247076930, 2718918248334300, 20442286928323170, 154564065790535680, 1174669811887063830
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