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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 6 |
| 4 | 12 |
| 5 | 19 |
| 6 | 30 |
| 7 | 45 |
| 8 | 90 |
| 9 | 147 |
| 10 | 230 |
| 11 | 343 |
| 12 | 504 |
| 13 | 716 |
| 14 | 994 |
| 15 | 1352 |
| 16 | 2704 |
| 17 | 4349 |
| 18 | 6469 |
[1,2,4,6,12,19,30,45,90,147,230,343,504,716,994, 1352,2704,4349,6469] |