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Search: id:A145550
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| A145550 |
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Number of distinct values taken by 10^10^...^10 (with n 10'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, 4766, 12486, 32972, 87807, 235365, 634792, 1720976, 4688090, 12824381, 35216108, 97037603, 268229329, 743562936, 2066686470, 5758171390, 16079351152
(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, A145548, A145549, A000081.
Sequence in context: A123467 A145548 A145549 this_sequence A000081 A124497 A093637
Adjacent sequences: A145547 A145548 A145549 this_sequence A145551 A145552 A145553
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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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