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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 12 |
| 4 | 21 |
| 5 | 4224 |
| 6 | 153426 |
| 7 | 442451 |
| 8 | 471614 |
| 9 | 523291 |
| 10 | 4336232 |
| 11 | 474335342 |
| 12 | 3624263478 |
| 13 | 36443455382 |
| 14 | 244936365228 |
| 15 | 452527642826 |
| 16 | 593326437534 |
| 17 | 4372566243537 |
[0,1,12,21,4224,153426,442451,471614,523291, 4336232,474335342,3624263478,36443455382, 244936365228,452527642826,593326437534, 4372566243537] |