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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 11 |
| 3 | 81 |
| 4 | 501 |
| 5 | 2811 |
| 6 | 14823 |
| 7 | 74883 |
| 8 | 366603 |
| 9 | 1752273 |
| 10 | 8218733 |
| 11 | 37964449 |
| 12 | 173172249 |
| 13 | 781607349 |
| 14 | 3496163949 |
| 15 | 15517771749 |
| 16 | 68412846069 |
| 17 | 299828796219 |
| 18 | 1307168814519 |
| 19 | 5672308893819 |
| 20 | 24511334499219 |
| 21 | 105519144602439 |
| 22 | 452695473616239 |
| 23 | 1936085243038839 |
| 24 | 8256615564926439 |
[0,1,11,81,501,2811,14823,74883,366603,1752273, 8218733,37964449,173172249,781607349,3496163949, 15517771749,68412846069,299828796219, 1307168814519,5672308893819,24511334499219, 105519144602439,452695473616239,1936085243038839, 8256615564926439] |