n | a(n) |
---|---|
2 | 0 |
3 | 1 |
4 | 4 |
5 | 21 |
6 | 134 |
7 | 1001 |
8 | 8544 |
9 | 81901 |
10 | 870274 |
11 | 10146321 |
12 | 128718044 |
13 | 1764651461 |
14 | 25992300894 |
15 | 409295679481 |
16 | 6860638482424 |
17 | 121951698034461 |
18 | 2291179503374234 |
19 | 45361686034627361 |
20 | 943892592746534964 |
21 | 20592893110265899381 |
22 | 470033715095287415734 |
[0,1,4,21,134,1001,8544,81901,870274,10146321, 128718044,1764651461,25992300894,409295679481, 6860638482424,121951698034461,2291179503374234, 45361686034627361,943892592746534964, 20592893110265899381,470033715095287415734] |