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A168449 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 60 |
| 4 | 520 |
| 5 | 5450 |
| 6 | 65830 |
| 7 | 886466 |
| 8 | 13005906 |
| 9 | 204607622 |
| 10 | 3412713687 |
| 11 | 59858823020 |
| 12 | 1097439583778 |
| 13 | 20934702108924 |
| 14 | 414042879930671 |
| 15 | 8466407067384676 |
| 16 | 178587080601453990 |
| 17 | 3878812336463745962 |
[1,2,9,60,520,5450,65830,886466,13005906, 204607622,3412713687,59858823020,1097439583778, 20934702108924,414042879930671,8466407067384676, 178587080601453990,3878812336463745962] |