n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 18 |
3 | 136 |
4 | 1155 |
5 | 10530 |
6 | 100688 |
7 | 996336 |
8 | 10116873 |
9 | 104819165 |
10 | 1103722620 |
11 | 11777187240 |
12 | 127067830773 |
13 | 1383914371728 |
14 | 15194457001440 |
15 | 167996704221280 |
16 | 1868870731122405 |
17 | 20903064321375315 |
18 | 234927317665726686 |
[1,3,18,136,1155,10530,100688,996336,10116873, 104819165,1103722620,11777187240,127067830773, 1383914371728,15194457001440,167996704221280, 1868870731122405,20903064321375315, 234927317665726686] |