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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 10 |
| 3 | 109 |
| 4 | 1351 |
| 5 | 19612 |
| 6 | 333451 |
| 7 | 6493069 |
| 8 | 141264820 |
| 9 | 3376695763 |
| 10 | 87799365343 |
| 11 | 2465959810690 |
| 12 | 74353064138749 |
| 13 | 2393123710957813 |
| 14 | 81812390963020066 |
| 15 | 2958191064076428793 |
| 16 | 112727516544416978299 |
| 17 | 4513118224822056822772 |
| 18 | 189305466502867876489519 |
[1,1,10,109,1351,19612,333451,6493069,141264820, 3376695763,87799365343,2465959810690, 74353064138749,2393123710957813,81812390963020066, 2958191064076428793,112727516544416978299, 4513118224822056822772,189305466502867876489519] |