Search: id:A100630
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%I A100630
%S A100630 1,2,5,6,14,23,24,54,86,119,120,264,414,566,719,720,1560,2424,3294,4166,
%T A100630 5039,5040,10800,16680,22584,28494,34406,40319,40320,85680,131760,
%U A100630 177960,224184,270414,316646,362879,362880,766080,1174320,1583280
%N A100630 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.
%C A100630 Row 2 is A052649.
%e A100630 Row 3, item 5 is 16680. Row 16680 of the order 8 table is 3 2 1 0 4 5 
               6 7.
%o A100630 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
%Y A100630 See A100711 for another version.
%Y A100630 Sequence in context: A083097 A006596 A000092 this_sequence A057302 A109784 
               A076624
%Y A100630 Adjacent sequences: A100627 A100628 A100629 this_sequence A100631 A100632 
               A100633
%K A100630 easy,nonn,tabl
%O A100630 2,2
%A A100630 Eugene McDonnell (eemcd(AT)mac.com), Dec 03 2004

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