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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 16 |
| 4 | 98 |
| 5 | 1252 |
| 6 | 39056 |
| 7 | 3235216 |
| 8 | 746947664 |
| 9 | 504955938112 |
| 10 | 1063702416056576 |
| 11 | 7035749505695570176 |
| 12 | 160587398553186610959104 |
| 13 | 12278492143557175831484111872 |
| 14 | 3469220019297527430713345352498176 |
[1,4,16,98,1252,39056,3235216,746947664, 504955938112,1063702416056576,7035749505695570176, 160587398553186610959104, 12278492143557175831484111872, 3469220019297527430713345352498176] |