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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 16 |
| 3 | 340 |
| 4 | 89520 |
| 5 | 290838284 |
| 6 | 12092687195284 |
| 7 | 6675338514190905402 |
| 8 | 50327836869668591230004816 |
| 9 | 5292118931181847999077738163123240 |
| 10 | 7888144623867099277720906683959732404332016 |
| 11 | 168815361056027801755263418243053345902341535059333028 |
[1,4,16,340,89520,290838284,12092687195284, 6675338514190905402,50327836869668591230004816, 5292118931181847999077738163123240, 7888144623867099277720906683959732404332016, 16881536105602780175526341824305334590234153505933\ 3028] |