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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 14 |
| 6 | 164 |
| 7 | 1589 |
| 8 | 15034 |
| 9 | 139465 |
| 10 | 1334945 |
| 11 | 13108425 |
| 12 | 134906641 |
| 13 | 1443572465 |
| 14 | 16238742806 |
| 15 | 190546010823 |
| 16 | 2347715040542 |
| 17 | 30162115442344 |
| 18 | 405859441345002 |
| 19 | 5684963539755583 |
| 20 | 83163913991455832 |
| 21 | 1263763900212930657 |
| 22 | 20000260465018111763 |
[0,0,0,0,1,14,164,1589,15034,139465,1334945, 13108425,134906641,1443572465,16238742806, 190546010823,2347715040542,30162115442344, 405859441345002,5684963539755583, 83163913991455832,1263763900212930657, 20000260465018111763] |