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Search: id:A145548
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| A145548 |
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Number of distinct values taken by 8^8^...^8 (with n 8's and parentheses inserted in all possible ways). |
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+0
9
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| 1, 1, 2, 4, 9, 20, 48, 115, 286, 719, 1842, 4765, 12482, 32957, 87756, 235198, 634261, 1719312, 4682952, 12808650, 35168306, 96893138, 267794711, 742260014, 2062792103
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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R. K. Guy and J. L. Selfridge, The nesting and roosting habits of the laddered parenthesis. Amer. Math. Monthly 80 (1973), 868-876.
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LINKS
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Index entries for sequences related to parenthesizing
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CROSSREFS
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Cf. A002845, A003018, A003019, A145545, A145546, A145547, A145549, A145550, A000081.
Adjacent sequences: A145545 A145546 A145547 this_sequence A145549 A145550 A145551
Sequence in context: A034826 A145547 A123467 this_sequence A145549 A145550 A000081
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KEYWORD
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more,nonn
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AUTHOR
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Jon E. Schoenfield (jonscho(AT)hiwaay.net), Oct 13 2008
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