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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 9 |
| 3 | 75 |
| 4 | 625 |
| 5 | 5145 |
| 6 | 42875 |
| 7 | 352947 |
| 8 | 2941225 |
| 9 | 28824005 |
| 10 | 282475249 |
| 11 | 4882786447 |
| 12 | 60287465315 |
| 13 | 744365643175 |
| 14 | 10212696624361 |
| 15 | 118890080527911 |
| 16 | 1387050939492295 |
| 17 | 17125833028425275 |
| 18 | 211451611881577375 |
| 19 | 2584630720649942503 |
| 20 | 30088718564300934153 |
| 21 | 351035049916844231785 |
[2,9,75,625,5145,42875,352947,2941225,28824005, 282475249,4882786447,60287465315,744365643175, 10212696624361,118890080527911,1387050939492295, 17125833028425275,211451611881577375, 2584630720649942503,30088718564300934153, 351035049916844231785] |