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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 6 |
| 3 | 15 |
| 4 | 36 |
| 5 | 45 |
| 6 | 447 |
| 7 | 1031 |
| 8 | 1239 |
| 9 | 3492 |
| 10 | 6069 |
| 11 | 13647 |
| 12 | 17238 |
| 13 | 56271 |
| 14 | 72711 |
| 15 | 75381 |
[0,6,15,36,45,447,1031,1239,3492,6069,13647,17238, 56271,72711,75381] |