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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 52 |
| 4 | 856 |
| 5 | 20085 |
| 6 | 628312 |
| 7 | 25055966 |
| 8 | 1233216256 |
| 9 | 73098133289 |
| 10 | 5118532806056 |
| 11 | 416870672801592 |
| 12 | 38985244916105216 |
| 13 | 4141541451563589853 |
| 14 | 495220504149290732672 |
| 15 | 66125635675588398919594 |
| 16 | 9792116564535122048290816 |
| 17 | 1598380441085583646763663697 |
[1,1,5,52,856,20085,628312,25055966,1233216256, 73098133289,5118532806056,416870672801592, 38985244916105216,4141541451563589853, 495220504149290732672,66125635675588398919594, 9792116564535122048290816, 1598380441085583646763663697] |