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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 10 |
| 3 | 21 |
| 4 | 330 |
| 5 | 78 |
| 6 | 2380 |
| 7 | 171 |
| 8 | 8855 |
| 9 | 475020 |
| 10 | 465 |
| 11 | 2324784 |
| 12 | 101270 |
| 13 | 903 |
| 14 | 178365 |
| 15 | 22957480 |
| 16 | 45057474 |
| 17 | 1830 |
| 18 | 99795696 |
| 19 | 971635 |
| 20 | 2628 |
| 21 | 277962685 |
| 22 | 1837620 |
| 23 | 581106988 |
| 24 | 144520208820 |
| 25 | 4082925 |
| 26 | 5253 |
| 27 | 5160610 |
| 28 | 5886 |
| 29 | 6438740 |
[3,10,21,330,78,2380,171,8855,475020,465,2324784, 101270,903,178365,22957480,45057474,1830,99795696, 971635,2628,277962685,1837620,581106988, 144520208820,4082925,5253,5160610,5886,6438740] |