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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 16 |
| 4 | 1517 |
| 5 | 18684 |
| 6 | 1024028 |
| 7 | 17066492 |
| 8 | 681728204 |
| 9 | 13916993782 |
| 10 | 467260456608 |
| 11 | 10754797724124 |
| 12 | 328076475659033 |
| 13 | 8091313110371792 |
| 14 | 233977398720987284 |
| 15 | 6002042996016384360 |
[0,1,16,1517,18684,1024028,17066492,681728204, 13916993782,467260456608,10754797724124, 328076475659033,8091313110371792, 233977398720987284,6002042996016384360] |