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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 38 |
| 4 | 352 |
| 5 | 3659 |
| 6 | 41012 |
| 7 | 484739 |
| 8 | 5959417 |
| 9 | 75523708 |
| 10 | 980470867 |
| 11 | 12980840984 |
| 12 | 174675568464 |
| 13 | 2382923659387 |
| 14 | 32890264803521 |
| 15 | 458576476085929 |
| 16 | 6450351908991558 |
| 17 | 91437202854436755 |
| 18 | 1305115286958337403 |
[1,1,5,38,352,3659,41012,484739,5959417,75523708, 980470867,12980840984,174675568464,2382923659387, 32890264803521,458576476085929,6450351908991558, 91437202854436755,1305115286958337403] |