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A119367
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Number of rooted planar n-trees whose number of leaves is equal to 2 modulo 3.
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2
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0, 0, 1, 3, 6, 11, 30, 126, 519, 1836, 5877, 18866, 65472, 242463, 905425, 3307371, 11889414, 42930441, 157641714, 586908936, 2194106568, 8189323686, 30541703733, 114219616809, 429214875498, 1619584557885, 6125465491551
(list; graph; refs; listen; history; internal format)
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