n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 5 |
5 | 21 |
6 | 61 |
7 | 281 |
8 | 2521 |
9 | 15625 |
10 | 84841 |
11 | 971521 |
12 | 10646461 |
13 | 83366141 |
14 | 962405445 |
15 | 15445935961 |
16 | 181502928881 |
17 | 2182235585041 |
18 | 42297481449361 |
19 | 714940186390465 |
20 | 10007476059187381 |
21 | 204722588272279141 |
22 | 4600003555996715021 |
23 | 80767827313930590681 |
[1,1,1,1,5,21,61,281,2521,15625,84841,971521, 10646461,83366141,962405445,15445935961, 181502928881,2182235585041,42297481449361, 714940186390465,10007476059187381, 204722588272279141,4600003555996715021, 80767827313930590681] |