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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 6 |
| 3 | 10 |
| 4 | 30 |
| 5 | 124 |
| 6 | 238 |
| 7 | 405 |
| 8 | 6430 |
| 9 | 22869 |
| 10 | 32657 |
| 11 | 224544 |
| 12 | 2396968 |
| 13 | 15229280 |
| 14 | 28274047 |
| 15 | 53458049 |
| 16 | 134537968 |
[3,6,10,30,124,238,405,6430,22869,32657,224544, 2396968,15229280,28274047,53458049,134537968] |