A177840 - cp's OEIS frontend

A177840 Consider the n pairs (1,2), ..., (2n-1,2n); a(n) is the number of permutations of [ 2n ] with no two fixed points for any pair.

n	a(n)
0	1
1	1
2	21
3	653
4	37577
5	3434169
6	457819549
7	83900098309
8	20238575173137
9	6217167231292913
10	2369809434953636261
11	1097587512530348834301
12	607119566298408076479961
13	395312612701784187384578473
14	299298318246814086742418737197
15	260721599469397754183307347278709

[1, 1, 21, 653, 37577, 3434169, 457819549, 83900098309, 20238575173137, 6217167231292913, 2369809434953636261, 1097587512530348834301, 607119566298408076479961, 395312612701784187384578473, 299298318246814086742418737197, 260721599469397754183307347278709]

cp's OEIS Frontend

A177840 Consider the n pairs (1,2), ..., (2n-1,2n); a(n) is the number of permutations of [ 2n ] with no two fixed points for any pair.

Table of values

List of values