| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 52 |
| 4 | 2027 |
| 5 | 70226 |
| 6 | 2280825 |
| 7 | 71112600 |
| 8 | 2155562551 |
| 9 | 64005323902 |
| 10 | 1870809923477 |
| 11 | 54006556365476 |
| 12 | 1543466751232275 |
| 13 | 43746473462661450 |
| 14 | 1231293799939647601 |
| 15 | 34451045198171912752 |
| 16 | 959005856055827234927 |
| 17 | 26576960554539062120726 |
| 18 | 733650711461388661963725 |
[0,0,1,52,2027,70226,2280825,71112600,2155562551, 64005323902,1870809923477,54006556365476, 1543466751232275,43746473462661450, 1231293799939647601,34451045198171912752, 959005856055827234927,26576960554539062120726, 733650711461388661963725] |