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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 11 |
| 3 | 131 |
| 4 | 1551 |
| 5 | 18371 |
| 6 | 217591 |
| 7 | 2577211 |
| 8 | 30525231 |
| 9 | 361549651 |
| 10 | 4282298471 |
| 11 | 50720779691 |
| 12 | 600751561311 |
| 13 | 7115474971331 |
| 14 | 84277740297751 |
| 15 | 998209892988571 |
| 16 | 11823086225851791 |
| 17 | 140036047414255411 |
| 18 | 1658627383815327431 |
| 19 | 19645261696111155851 |
[0,1,11,131,1551,18371,217591,2577211,30525231, 361549651,4282298471,50720779691,600751561311, 7115474971331,84277740297751,998209892988571, 11823086225851791,140036047414255411, 1658627383815327431,19645261696111155851] |