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Search: id:A145546
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| A145546 |
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Number of distinct values taken by 6^6^...^6 (with n 6's and parentheses inserted in all possible ways). |
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9
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| 1, 1, 2, 4, 9, 20, 48, 115, 286, 718, 1838, 4750, 12431, 32790, 87225, 233534, 629123, 1703586, 4635181, 12664335, 34734322, 95592704, 263909594
(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, A145547, A145548, A145549, A145550, A000081.
Sequence in context: A034824 A145545 A034825 this_sequence A034826 A145547 A123467
Adjacent sequences: A145543 A145544 A145545 this_sequence A145547 A145548 A145549
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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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