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A003318
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a(n + 1) = 1 + a([ n/1 ]) + a([ n/2 ]) + ... + a([ n/n ]).
(Formerly M1052)
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1
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1, 2, 4, 7, 12, 18, 28, 39, 55, 74, 100, 127, 167, 208, 261, 322, 399, 477, 581, 686, 820, 967, 1142, 1318, 1545, 1778, 2053, 2347, 2697, 3048, 3486, 3925, 4441, 4986, 5610
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| Goldberg, M. K.; Livshits, E. M.; Minimal universal trees. (Russian) Mat. Zametki 4 1968 371-379.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
R. C. Read, personal communication.
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CROSSREFS
| Cf. A003238.
Sequence in context: A175812 A002621 A033500 * A035300 A035296 A105807
Adjacent sequences: A003315 A003316 A003317 * A003319 A003320 A003321
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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