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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 6 |
| 3 | 128 |
| 4 | 2500 |
| 5 | 51840 |
| 6 | 1176490 |
| 7 | 29360128 |
| 8 | 803538792 |
| 9 | 24000000000 |
| 10 | 778122738030 |
| 11 | 27243640258560 |
| 12 | 1025115745389164 |
| 13 | 41273168209215488 |
| 14 | 1771037512207031250 |
| 15 | 80704505322479288320 |
| 16 | 3892895350053349478480 |
| 17 | 198189314749641818898432 |
[0,6,128,2500,51840,1176490,29360128,803538792, 24000000000,778122738030,27243640258560, 1025115745389164,41273168209215488, 1771037512207031250,80704505322479288320, 3892895350053349478480,198189314749641818898432] |