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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 16 |
| 4 | 22 |
| 5 | 31 |
| 6 | 72 |
| 7 | 270 |
| 8 | 342 |
| 9 | 1848 |
| 10 | 6421 |
| 11 | 6691 |
| 12 | 14618 |
| 13 | 26894 |
| 14 | 40006 |
| 15 | 54624 |
| 16 | 121524 |
[1,2,5,16,22,31,72,270,342,1848,6421,6691,14618, 26894,40006,54624,121524] |