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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 63 |
| 4 | 2056 |
| 5 | 112625 |
| 6 | 9266706 |
| 7 | 1067280319 |
| 8 | 163802295616 |
| 9 | 32300931452769 |
| 10 | 7956776354536450 |
| 11 | 2394142654816299431 |
| 12 | 863996246301971667600 |
| 13 | 368314015001746325448313 |
| 14 | 183100281424495288847092386 |
| 15 | 104989565698848905178879275775 |
| 16 | 68778360046311927838608116567296 |
| 17 | 51049027217135211093037275781929857 |
| 18 | 42614907995326324626989103964953188610 |
| 19 | 39750079580111447237206552931429888023399 |
| 20 | 41188867531604111691413161924808444678694800 |
| 21 | 47163303540183246052916530453746351377795346681 |
[1,4,63,2056,112625,9266706,1067280319, 163802295616,32300931452769,7956776354536450, 2394142654816299431,863996246301971667600, 368314015001746325448313, 183100281424495288847092386, 104989565698848905178879275775, 68778360046311927838608116567296, 51049027217135211093037275781929857, 42614907995326324626989103964953188610, 39750079580111447237206552931429888023399, 41188867531604111691413161924808444678694800, 47163303540183246052916530453746351377795346681] |