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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 6 |
| 3 | 113573 |
| 4 | 230801 |
| 5 | 941071 |
| 6 | 5166859 |
| 7 | 30956561 |
| 8 | 123081011 |
| 9 | 3050325741 |
| 10 | 14086296281 |
| 11 | 60060345973 |
| 12 | 120331687901 |
| 13 | 316465918571 |
| 14 | 634257678809 |
| 15 | 8042099198501 |
| 16 | 34761370800833 |
| 17 | 134702376451061 |
| 18 | 269979973606237 |
[3,6,113573,230801,941071,5166859,30956561, 123081011,3050325741,14086296281,60060345973, 120331687901,316465918571,634257678809, 8042099198501,34761370800833,134702376451061, 269979973606237] |