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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 11 |
| 3 | 74 |
| 4 | 697 |
| 5 | 8002 |
| 6 | 115158 |
| 7 | 1949640 |
| 8 | 38662510 |
| 9 | 872245634 |
| 10 | 22150393253 |
| 11 | 623661939852 |
| 12 | 19296665400632 |
| 13 | 650198159192554 |
| 14 | 23700604926216759 |
| 15 | 928939297013294294 |
| 16 | 38956230043045053042 |
| 17 | 1740248411222193973416 |
[1,2,11,74,697,8002,115158,1949640,38662510, 872245634,22150393253,623661939852,19296665400632, 650198159192554,23700604926216759, 928939297013294294,38956230043045053042, 1740248411222193973416] |