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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 6 |
| 4 | 10 |
| 5 | 13 |
| 6 | 36 |
| 7 | 60 |
| 8 | 100 |
| 9 | 1000 |
| 10 | 10000 |
| 11 | 100000 |
| 12 | 129155 |
| 13 | 278256 |
| 14 | 1000000 |
| 15 | 10000000 |
| 16 | 21544347 |
| 17 | 100000000 |
| 18 | 1000000000 |
| 19 | 10000000000 |
| 20 | 59948425032 |
| 21 | 100000000000 |
| 22 | 599484250319 |
| 23 | 1000000000000 |
| 24 | 10000000000000 |
| 25 | 100000000000000 |
| 26 | 464158883361278 |
| 27 | 1000000000000000 |
[0,1,6,10,13,36,60,100,1000,10000,100000,129155, 278256,1000000,10000000,21544347,100000000, 1000000000,10000000000,59948425032,100000000000, 599484250319,1000000000000,10000000000000, 100000000000000,464158883361278,1000000000000000] |