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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 66 |
| 3 | 1338 |
| 4 | 43686 |
| 5 | 2142277 |
| 6 | 149056260 |
| 7 | 13991691663 |
| 8 | 1705750869937 |
| 9 | 262268740077763 |
| 10 | 49694977078927305 |
| 11 | 11388565848749818055 |
| 12 | 3107918736854019004136 |
| 13 | 996840601151518793573156 |
| 14 | 371595543159269706775806375 |
| 15 | 159437222426663041455988930042 |
| 16 | 78072200940916732097886063687252 |
[1,5,66,1338,43686,2142277,149056260,13991691663, 1705750869937,262268740077763,49694977078927305, 11388565848749818055,3107918736854019004136, 996840601151518793573156, 371595543159269706775806375, 159437222426663041455988930042, 78072200940916732097886063687252] |