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A027581 Sequence satisfies T(T(a))=a, where T is defined below. +0
2
1, 1, 1, 2, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 21, 26, 30, 36, 43, 49, 58, 69, 79, 91, 106, 122, 140, 161, 183, 209, 239, 271, 308, 348, 392, 444, 501, 561, 630, 708, 791, 884, 989, 1101, 1225, 1365, 1516, 1681, 1863, 2062, 2282, 2522, 2782, 3069, 3381, 3719, 4092 (list; graph; listen)
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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.


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