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Search: id:A100630
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| A100630 |
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Triangle read by rows: row n gives the index number in the tables of permutations of order n+1, n+2, ... of the permutation in which the first n items are reversed, and the remaining items are in order. |
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2
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| 1, 2, 5, 6, 14, 23, 24, 54, 86, 119, 120, 264, 414, 566, 719, 720, 1560, 2424, 3294, 4166, 5039, 5040, 10800, 16680, 22584, 28494, 34406, 40319, 40320, 85680, 131760, 177960, 224184, 270414, 316646, 362879, 362880, 766080, 1174320, 1583280
(list; table; graph; listen)
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OFFSET
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2,2
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COMMENT
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Row 2 is A052649.
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EXAMPLE
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Row 3, item 5 is 16680. Row 16680 of the order 8 table is 3 2 1 0 4 5 6 7.
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PROGRAM
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Using Iverson's J language, A. p for a permutation p gives the row number in the table of permutations of order (length of p) which has p as its value. For example, q 0 4 9 6 7 5 1 11 8 10 2 3 A. q 13610272
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CROSSREFS
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See A100711 for another version.
Adjacent sequences: A100627 A100628 A100629 this_sequence A100631 A100632 A100633
Sequence in context: A083097 A006596 A000092 this_sequence A057302 A109784 A076624
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KEYWORD
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easy,nonn,tabl
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AUTHOR
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Eugene McDonnell (eemcd(AT)mac.com), Dec 03 2004
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