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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 76 |
| 4 | 1201 |
| 5 | 21252 |
| 6 | 402892 |
| 7 | 8001412 |
| 8 | 164321982 |
| 9 | 3461110532 |
| 10 | 74358814838 |
| 11 | 1623152780808 |
| 12 | 35897318940028 |
| 13 | 802620009567628 |
| 14 | 18112759482614328 |
| 15 | 412020809942451504 |
| 16 | 9437537418826749369 |
| 17 | 217486633306640519124 |
[1,1,6,76,1201,21252,402892,8001412,164321982, 3461110532,74358814838,1623152780808, 35897318940028,802620009567628,18112759482614328, 412020809942451504,9437537418826749369, 217486633306640519124] |