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A145549
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Number of distinct values taken by 9^9^...^9 (with n 9's and parentheses inserted in all possible ways).
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15
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1, 1, 2, 4, 9, 20, 48, 115, 286, 719, 1842, 4766, 12485, 32969, 87795, 235326, 634664, 1720573, 4686829, 12820504, 35204254, 97001655, 268120807, 743236814, 2065709551, 5755253457
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OFFSET
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1,3
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COMMENTS
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The subsequence of primes begins 2, 719, 32969. No more through a(26). [Jonathan Vos Post, Apr 02 2011]
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LINKS
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CROSSREFS
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KEYWORD
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more,nonn
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AUTHOR
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STATUS
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approved
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