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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 26664 |
| 5 | 298661 |
| 6 | 386985404 |
| 7 | 646010808 |
| 8 | 218856976 |
| 9 | 288157046 |
| 10 | 460585223 |
| 11 | 736514774 |
| 12 | 427530937 |
| 13 | 259106618 |
| 14 | 767004366 |
| 15 | 507197867 |
| 16 | 489519319 |
| 17 | 2141658661 |
| 18 | 3329758512 |
| 19 | 3706874373 |
| 20 | 2129616273 |
| 21 | 8563597152 |
| 22 | 3644768698 |
| 23 | 9667076604 |
[1,2,6,26664,298661,386985404,646010808,218856976, 288157046,460585223,736514774,427530937,259106618, 767004366,507197867,489519319,2141658661, 3329758512,3706874373,2129616273,8563597152, 3644768698,9667076604] |