A125188 - cp's OEIS frontend

A125188 Number of Dumont permutations of the first kind of length 2n avoiding the patterns 2413 and 4132. Also number of Dumont permutations of the first kind of length 2n avoiding the patterns 1423 and 3142.

n	a(n)
0	1
1	1
2	3
3	12
4	54
5	259
6	1294
7	6655
8	34986
9	187149
10	1015407
11	5574829
12	30915904
13	172933249
14	974605751
15	5528804444
16	31546576802
17	180931023589
18	1042503934315
19	6031773336043
20	35030156585236
21	204135876541762
22	1193291688154639

[1, 1, 3, 12, 54, 259, 1294, 6655, 34986, 187149, 1015407, 5574829, 30915904, 172933249, 974605751, 5528804444, 31546576802, 180931023589, 1042503934315, 6031773336043, 35030156585236, 204135876541762, 1193291688154639]

cp's OEIS Frontend

A125188 Number of Dumont permutations of the first kind of length 2n avoiding the patterns 2413 and 4132. Also number of Dumont permutations of the first kind of length 2n avoiding the patterns 1423 and 3142.

Table of values

List of values