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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 486 |
| 3 | 17496 |
| 4 | 393660 |
| 5 | 7085880 |
| 6 | 111602610 |
| 7 | 1607077584 |
| 8 | 21695547384 |
| 9 | 278942752080 |
| 10 | 3451916556990 |
| 11 | 41422998683880 |
| 12 | 484649084601396 |
| 13 | 5551434969070536 |
| 14 | 62453643402043530 |
| 15 | 691794203838020640 |
| 16 | 7560322370515511280 |
| 17 | 81651481601567521824 |
| 18 | 872650209616752889494 |
[0,486,17496,393660,7085880,111602610,1607077584, 21695547384,278942752080,3451916556990, 41422998683880,484649084601396,5551434969070536, 62453643402043530,691794203838020640, 7560322370515511280,81651481601567521824, 872650209616752889494] |