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A165976
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Number of sequences of n pairs of balanced brackets of three types, round, square, and angle, such that no square brackets are allowed inside matching round brackets.
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0
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1, 3, 17, 117, 887, 7131, 59661, 513897, 4526603, 40588263, 369277481, 3400840845, 31644776383, 297079014771, 2810553697989, 26770090211793, 256510096740243, 2470981627433919, 23916768109136289, 232485664356533877
(list; graph; refs; listen; history; internal format)
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