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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 174 |
| 3 | 796 |
| 4 | 4304 |
| 5 | 24364 |
| 6 | 138774 |
| 7 | 781071 |
| 8 | 4432262 |
| 9 | 25124403 |
| 10 | 142234863 |
| 11 | 806138743 |
| 12 | 4569541386 |
| 13 | 25893792606 |
| 14 | 146748270319 |
| 15 | 831716656289 |
| 16 | 4713611192492 |
| 17 | 26713984720758 |
| 18 | 151401393855722 |
| 19 | 858059003257182 |
| 20 | 4863005923218672 |
[3,174,796,4304,24364,138774,781071,4432262, 25124403,142234863,806138743,4569541386, 25893792606,146748270319,831716656289, 4713611192492,26713984720758,151401393855722, 858059003257182,4863005923218672] |