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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 15 |
| 3 | 66 |
| 4 | 190 |
| 5 | 435 |
| 6 | 861 |
| 7 | 1540 |
| 8 | 2556 |
| 9 | 4005 |
| 10 | 5995 |
| 11 | 8646 |
| 12 | 12090 |
| 13 | 16471 |
| 14 | 21945 |
[1,15,66,190,435,861,1540,2556,4005,5995,8646, 12090,16471,21945] |