This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A127124 Number of endofunctions whose component sizes form the n-th partition in Mathematica order. 1
 1, 1, 2, 1, 4, 2, 1, 9, 4, 3, 2, 1, 20, 9, 8, 4, 3, 2, 1, 51, 20, 18, 9, 10, 8, 4, 4, 3, 2, 1, 125, 51, 40, 20, 36, 18, 9, 10, 12, 8, 4, 4, 3, 2, 1, 329, 125, 102, 51, 80, 40, 20, 45, 36, 27, 18, 9, 20, 10, 12, 8, 4, 5, 4, 3, 2, 1, 862, 329, 250, 125, 204, 102, 51, 180, 80, 60, 40, 20, 45 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Can be regarded as a triangle with one row for each size of partition. LINKS EXAMPLE For n = 3, the 7 endofunctions are (1,2,3) -> (1,1,1), (1,1,2), (1,2,1), (2,1,1), (1,2,3), (1,3,2) and (2,3,1). The components are respectively 123, 123, 13|2, 123, 1|2|3, 1|23 and 123, corresponding to partitions [3], [3], [2,1], [3], [1^3], [2,1] and [3]. The partitions of 3 in Mathematica order are [3], [2,1] and [1^3], so row 3 is 4,2,1. The triangle starts: 1 1 2 1 4 2 1 9 4 3 2 1 20 9 8 4 3 2 1 CROSSREFS Sequence in context: A158264 A274106 A158982 * A127136 A239101 A145983 Adjacent sequences:  A127121 A127122 A127123 * A127125 A127126 A127127 KEYWORD nonn,tabf AUTHOR Franklin T. Adams-Watters, Jan 05 2007 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 20 04:42 EDT 2019. Contains 322294 sequences. (Running on oeis4.)