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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 31 |
| 4 | 276 |
| 5 | 3238 |
| 6 | 47463 |
| 7 | 830415 |
| 8 | 16845619 |
| 9 | 388198577 |
| 10 | 10009945747 |
| 11 | 285452668383 |
| 12 | 8918294580680 |
| 13 | 302912273410475 |
| 14 | 11112687415252836 |
| 15 | 437907284782655738 |
| 16 | 18447025981637731050 |
| 17 | 827246579683710818081 |
| 18 | 39346558272075085340201 |
| 19 | 1978423430905859200399397 |
[1,5,31,276,3238,47463,830415,16845619,388198577, 10009945747,285452668383,8918294580680, 302912273410475,11112687415252836, 437907284782655738,18447025981637731050, 827246579683710818081,39346558272075085340201, 1978423430905859200399397] |