n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 12 |
4 | 57 |
5 | 332 |
6 | 2209 |
7 | 16730 |
8 | 140609 |
9 | 1302664 |
10 | 13137441 |
11 | 143354574 |
12 | 1680017889 |
13 | 21043179068 |
14 | 280310970385 |
15 | 3955899181730 |
16 | 58931602709633 |
17 | 923925812276752 |
18 | 15201851967182913 |
19 | 261859798838325270 |
[1,1,3,12,57,332,2209,16730,140609,1302664, 13137441,143354574,1680017889,21043179068, 280310970385,3955899181730,58931602709633, 923925812276752,15201851967182913, 261859798838325270] |