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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 9 |
| 3 | 88 |
| 4 | 935 |
| 5 | 10576 |
| 6 | 125398 |
| 7 | 1541842 |
| 8 | 19510569 |
| 9 | 252692488 |
| 10 | 3336041258 |
| 11 | 44754332228 |
| 12 | 608627917092 |
| 13 | 8374308526624 |
| 14 | 116400823021244 |
| 15 | 1632397871933462 |
| 16 | 23073139088034053 |
| 17 | 328412887616247352 |
| 18 | 4703787284447392654 |
| 19 | 67751302345297146628 |
| 20 | 980837632950784897364 |
[0,1,9,88,935,10576,125398,1541842,19510569, 252692488,3336041258,44754332228,608627917092, 8374308526624,116400823021244,1632397871933462, 23073139088034053,328412887616247352, 4703787284447392654,67751302345297146628, 980837632950784897364] |