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| n | a(n) |
|---|---|
| 1 | 537 |
| 2 | 3330 |
| 3 | 27654 |
| 4 | 233058 |
| 5 | 1967814 |
| 6 | 16608978 |
| 7 | 140136942 |
| 8 | 1182218562 |
| 9 | 9972840630 |
| 10 | 84126136626 |
| 11 | 709642323294 |
| 12 | 5986137534306 |
| 13 | 50495575069542 |
| 14 | 425951091141138 |
| 15 | 3593073160699854 |
| 16 | 30309051837484290 |
| 17 | 255669326170893078 |
[537,3330,27654,233058,1967814,16608978,140136942, 1182218562,9972840630,84126136626,709642323294, 5986137534306,50495575069542,425951091141138, 3593073160699854,30309051837484290, 255669326170893078] |