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A145547
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Number of distinct values taken by 7^7^...^7 (with n 7'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, 1841, 4762, 12470, 32918, 87628, 234795, 633000, 1715435, 4671098, 12772707, 35059815, 96567161, 266818396, 739344427
(list;
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text;
internal format)
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OFFSET
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1,3
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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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