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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 85 |
| 3 | 3237 |
| 4 | 27229 |
| 5 | 163762 |
| 6 | 865821 |
| 7 | 4098895 |
| 8 | 18213313 |
| 9 | 76987169 |
| 10 | 312665502 |
| 11 | 1230221726 |
| 12 | 4717647935 |
| 13 | 17711793715 |
| 14 | 65341972674 |
| 15 | 237540919189 |
| 16 | 852805158008 |
| 17 | 3028838128471 |
| 18 | 10656713673211 |
| 19 | 37186870963633 |
| 20 | 128821858880480 |
[0,85,3237,27229,163762,865821,4098895,18213313, 76987169,312665502,1230221726,4717647935, 17711793715,65341972674,237540919189,852805158008, 3028838128471,10656713673211,37186870963633, 128821858880480] |