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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 22 |
| 4 | 343 |
| 5 | 4665 |
| 6 | 58993 |
| 7 | 713385 |
| 8 | 8368417 |
| 9 | 96029849 |
| 10 | 1083755281 |
| 11 | 12072120713 |
| 12 | 133066886145 |
| 13 | 1454125651577 |
| 14 | 15775824417009 |
| 15 | 170103923182448 |
| 16 | 1824496021947951 |
| 17 | 19479528120714094 |
| 18 | 207140960219486637 |
| 19 | 2194866392318323180 |
| 20 | 23183231824417799723 |
[0,0,1,22,343,4665,58993,713385,8368417,96029849, 1083755281,12072120713,133066886145,1454125651577, 15775824417009,170103923182448,1824496021947951, 19479528120714094,207140960219486637, 2194866392318323180,23183231824417799723] |