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| n | a(n) |
|---|---|
| 1 | 28 |
| 2 | 140 |
| 3 | 334 |
| 4 | 103 |
| 5 | 14881 |
| 6 | 246332 |
| 7 | 838638 |
| 8 | 324469 |
| 9 | 54328646 |
| 10 | 960991707 |
| 11 | 3157790020 |
| 12 | 1057637803 |
| 13 | 221465699177 |
| 14 | 4636455864017 |
| 15 | 17172840400292 |
| 16 | 6213696250684 |
| 17 | 1322921262723003 |
| 18 | 27235717697960253 |
| 19 | 96311573893944098 |
| 20 | 32407513702617077 |
[28,140,334,103,14881,246332,838638,324469, 54328646,960991707,3157790020,1057637803, 221465699177,4636455864017,17172840400292, 6213696250684,1322921262723003,27235717697960253, 96311573893944098,32407513702617077] |