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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 54 |
| 4 | 656 |
| 5 | 10000 |
| 6 | 182952 |
| 7 | 3899224 |
| 8 | 94769152 |
| 9 | 2584929024 |
| 10 | 78145100000 |
| 11 | 2592261435104 |
| 12 | 93586594074624 |
| 13 | 3651967705305088 |
| 14 | 153140949522798720 |
| 15 | 6866498202750000000 |
| 16 | 327772442129447518208 |
| 17 | 16593897777705323921408 |
[1,1,6,54,656,10000,182952,3899224,94769152, 2584929024,78145100000,2592261435104, 93586594074624,3651967705305088, 153140949522798720,6866498202750000000, 327772442129447518208,16593897777705323921408] |