n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 7 |
4 | 17 |
5 | 116 |
6 | 536 |
7 | 3732 |
8 | 21609 |
9 | 152225 |
10 | 991680 |
11 | 7142207 |
12 | 49671146 |
13 | 364955208 |
14 | 2644449147 |
15 | 19764753353 |
16 | 147264417970 |
17 | 1116423286310 |
18 | 8488332597668 |
19 | 65109780090520 |
20 | 502742629038600 |
21 | 3893865922507871 |
22 | 30436537169536769 |
23 | 237651376621912220 |
[1,1,1,7,17,116,536,3732,21609,152225,991680, 7142207,49671146,364955208,2644449147,19764753353, 147264417970,1116423286310,8488332597668, 65109780090520,502742629038600,3893865922507871, 30436537169536769,237651376621912220] |