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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 81 |
| 3 | 2330 |
| 4 | 97405 |
| 5 | 5360607 |
| 6 | 366432990 |
| 7 | 29948982492 |
| 8 | 2849278444155 |
| 9 | 309333396512855 |
| 10 | 37741150862494651 |
| 11 | 5112458462852223210 |
| 12 | 761358344010536141506 |
| 13 | 123636426598733578925150 |
| 14 | 21742842987398075489784900 |
| 15 | 4116720379411455407932693320 |
| 16 | 834934865669512891440715729125 |
[1,5,81,2330,97405,5360607,366432990,29948982492, 2849278444155,309333396512855,37741150862494651, 5112458462852223210,761358344010536141506, 123636426598733578925150, 21742842987398075489784900, 4116720379411455407932693320, 834934865669512891440715729125] |