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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 9 |
| 3 | 100 |
| 4 | 1237 |
| 5 | 18896 |
| 6 | 337663 |
| 7 | 6941194 |
| 8 | 161357425 |
| 9 | 4186540456 |
| 10 | 119942830785 |
| 11 | 3761004532550 |
| 12 | 128121728853479 |
| 13 | 4711881688294652 |
| 14 | 186065500280409423 |
| 15 | 7852240169544076190 |
| 16 | 352684377274345906213 |
| 17 | 16798134072300013751064 |
[0,2,9,100,1237,18896,337663,6941194,161357425, 4186540456,119942830785,3761004532550, 128121728853479,4711881688294652, 186065500280409423,7852240169544076190, 352684377274345906213,16798134072300013751064] |