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A030299
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Permutations of lengths 1, 2, 3, ... arranged lexicographically.
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10
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1, 12, 21, 123, 132, 213, 231, 312, 321, 1234, 1243, 1324, 1342, 1423, 1432, 2134, 2143, 2314, 2341, 2413, 2431, 3124, 3142, 3214, 3241, 3412, 3421, 4123, 4132, 4213, 4231, 4312, 4321, 12345, 12354, 12435, 12453, 12534, 12543, 13245, 13254, 13425
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Numbers whose digits are permutations of (1,2,3,4,...,i) for some i >= 1.
This is very clumsy once the length exceeds 9. For example, after 987654321 we get 12345678910, 12345678109, ... A030298 is a better version.
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CROSSREFS
| Cf. A030298, A055089, A060117, A181073.
Sequence in context: A201015 A044005 A134514 * A001292 A162391 A114015
Adjacent sequences: A030296 A030297 A030298 * A030300 A030301 A030302
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KEYWORD
| nonn,easy,base
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Clark Kimberling (ck6(AT)evansville.edu)
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EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com), Feb 23 2010
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