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| n | a(n) |
|---|---|
| 1 | 632 |
| 2 | 1246 |
| 3 | 3948 |
| 4 | 14437 |
| 5 | 39372 |
| 6 | 158437 |
| 7 | 554824 |
| 8 | 2203303 |
| 9 | 7843906 |
| 10 | 30466049 |
| 11 | 113590802 |
| 12 | 441081353 |
| 13 | 1649380080 |
| 14 | 6378340507 |
| 15 | 24111571374 |
| 16 | 93224628427 |
| 17 | 352830579988 |
| 18 | 1361940600445 |
| 19 | 5170282798940 |
| 20 | 19947364408573 |
| 21 | 75793555364736 |
[632,1246,3948,14437,39372,158437,554824,2203303, 7843906,30466049,113590802,441081353,1649380080, 6378340507,24111571374,93224628427,352830579988, 1361940600445,5170282798940,19947364408573, 75793555364736] |