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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 20 |
| 5 | 53 |
| 6 | 161 |
| 7 | 380 |
| 8 | 500 |
| 9 | 530 |
| 10 | 698 |
| 11 | 832 |
| 12 | 833 |
| 13 | 6353 |
| 14 | 25433 |
| 15 | 53921 |
| 16 | 73538 |
[1,2,5,20,53,161,380,500,530,698,832,833,6353, 25433,53921,73538] |