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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 13 |
| 3 | 104 |
| 4 | 940 |
| 5 | 9166 |
| 6 | 94044 |
| 7 | 1000602 |
| 8 | 10939780 |
| 9 | 122161128 |
| 10 | 1387361151 |
| 11 | 15974899766 |
| 12 | 186069556707 |
| 13 | 2188416960148 |
| 14 | 25953579753464 |
| 15 | 310022550197360 |
| 16 | 3726709235290628 |
| 17 | 45047517497268968 |
| 18 | 547217895030263028 |
| 19 | 6676784544374859088 |
| 20 | 81789906534091716353 |
[1,2,13,104,940,9166,94044,1000602,10939780, 122161128,1387361151,15974899766,186069556707, 2188416960148,25953579753464,310022550197360, 3726709235290628,45047517497268968, 547217895030263028,6676784544374859088, 81789906534091716353] |