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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 7 |
| 5 | 10 |
| 6 | 92 |
| 7 | 1099 |
| 8 | 29530 |
| 9 | 281473 |
| 10 | 657892 |
| 11 | 3313964 |
| 12 | 9816013 |
| 13 | 18669155396 |
| 14 | 94849225930 |
| 15 | 358676424226 |
| 16 | 957439868543 |
| 17 | 1586504109310 |
| 18 | 41431374800470 |
| 19 | 241469610359708 |
| 20 | 256165266592379 |
[1,2,4,7,10,92,1099,29530,281473,657892,3313964, 9816013,18669155396,94849225930,358676424226, 957439868543,1586504109310,41431374800470, 241469610359708,256165266592379] |