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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 11 |
| 3 | 88 |
| 4 | 881 |
| 5 | 10526 |
| 6 | 145867 |
| 7 | 2294636 |
| 8 | 40302593 |
| 9 | 780263866 |
| 10 | 16483592171 |
| 11 | 376901809472 |
| 12 | 9265228770481 |
| 13 | 243493769839958 |
| 14 | 6808261249400171 |
| 15 | 201697053847178836 |
| 16 | 6308214318127014017 |
| 17 | 207622266953125336946 |
| 18 | 7170928402389293540683 |
| 19 | 259247888385780787392296 |
[1,2,11,88,881,10526,145867,2294636,40302593, 780263866,16483592171,376901809472,9265228770481, 243493769839958,6808261249400171, 201697053847178836,6308214318127014017, 207622266953125336946,7170928402389293540683, 259247888385780787392296] |