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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 16 |
| 3 | 400 |
| 4 | 23716 |
| 5 | 3179520 |
| 6 | 953574400 |
| 7 | 627097603968 |
| 8 | 924914073760000 |
| 9 | 3050440754161147200 |
| 10 | 22736725050654514945600 |
| 11 | 381669581712710598918922368 |
| 12 | 14487934510226746411430441441536 |
| 13 | 1241349850723840266193329456972217472 |
[2,16,400,23716,3179520,953574400,627097603968, 924914073760000,3050440754161147200, 22736725050654514945600, 381669581712710598918922368, 14487934510226746411430441441536, 1241349850723840266193329456972217472] |