|
Search: id:A117514
|
|
|
| A117514 |
|
Number of ways of arranging 2n tokens in a row, with 2 copies of each token from 1 through n, such that the first token is a 1 and between every pair of tokens labeled i (i=1..n) there is exactly one taken labeled (i+1 mod n). |
|
+0
4
|
| |
|
|
|
|
Search completed in 0.002 seconds
|
