n | a(n) |
---|---|
1 | 1 |
2 | 9 |
3 | 56 |
4 | 337 |
5 | 2025 |
6 | 12152 |
7 | 72913 |
8 | 437481 |
9 | 2624888 |
10 | 15749329 |
11 | 94495977 |
12 | 566975864 |
13 | 3401855185 |
14 | 20411131113 |
15 | 122466786680 |
16 | 734800720081 |
17 | 4408804320489 |
18 | 26452825922936 |
19 | 158716955537617 |
20 | 952301733225705 |
21 | 5713810399354232 |
[1,9,56,337,2025,12152,72913,437481,2624888, 15749329,94495977,566975864,3401855185, 20411131113,122466786680,734800720081, 4408804320489,26452825922936,158716955537617, 952301733225705,5713810399354232] |