This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A094315 Triangle read by rows giving number of circular permutations of n letters such that all letters are displaced by no more than k places from their original position. 0
 1, 0, 1, 0, 0, 2, 0, 0, 0, 6, 1, 0, 6, 8, 9, 2, 15, 20, 40, 30, 13, 20, 72, 180, 176, 180, 72, 20, 144, 609, 1106, 1421, 980, 595, 154, 31, 1265, 4960, 9292, 10352, 8326, 4096, 1676, 304, 49 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 COMMENTS The n-th row sums to n!. REFERENCES J. Riordan, Discordant permutations, Scripta Math., 20 (1954), 14-23. Anthony C. Robin, Circular Wife Swapping, The Mathematical Gazette, November 2006. LINKS EXAMPLE 1; 0, 1; 0, 0, 2; 0, 0, 0, 6; 1, 0, 6, 8, 9; 2, 15, 20, 40, 30, 13; 20, 72, 180, 176, 180, 72, 20; 144, 609, 1106, 1421, 980, 595, 154, 31; CROSSREFS Diagonals give A000183 (which has further references), A000476, A000388, A000380, A000440, etc. Sequence in context: A136572 A053203 A158360 * A212148 A048146 A028973 Adjacent sequences:  A094312 A094313 A094314 * A094316 A094317 A094318 KEYWORD nonn,tabl AUTHOR N. J. A. Sloane, based on a suggestion from Anthony C Robin, Jun 02 2004 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .