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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 23 |
| 3 | 486 |
| 4 | 8108 |
| 5 | 126903 |
| 6 | 1955375 |
| 7 | 30064393 |
| 8 | 462569756 |
| 9 | 7127871677 |
| 10 | 110032675158 |
| 11 | 1701716646013 |
| 12 | 26365297553133 |
| 13 | 409178131040177 |
| 14 | 6360241131134572 |
| 15 | 99006293076495153 |
| 16 | 1543225051401234780 |
| 17 | 24083853470118205024 |
[0,23,486,8108,126903,1955375,30064393,462569756, 7127871677,110032675158,1701716646013, 26365297553133,409178131040177,6360241131134572, 99006293076495153,1543225051401234780, 24083853470118205024] |