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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 7 |
| 4 | 12 |
| 5 | 15 |
| 6 | 43 |
| 7 | 438 |
| 8 | 607 |
| 9 | 1200 |
| 10 | 2724 |
| 11 | 5209 |
| 12 | 59388 |
| 13 | 118215 |
| 14 | 198528 |
[0,3,7,12,15,43,438,607,1200,2724,5209,59388, 118215,198528] |