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| n | a(n) |
|---|---|
| 1 | 684 |
| 2 | 1146 |
| 3 | 9483 |
| 4 | 40401 |
| 5 | 235003 |
| 6 | 1025854 |
| 7 | 4969133 |
| 8 | 22190358 |
| 9 | 100488243 |
| 10 | 437074150 |
| 11 | 1877449556 |
| 12 | 7754457028 |
| 13 | 30996990781 |
| 14 | 118227838313 |
| 15 | 431216031421 |
| 16 | 1495925257951 |
| 17 | 4946248543125 |
| 18 | 15573619100906 |
| 19 | 46781648655093 |
[684,1146,9483,40401,235003,1025854,4969133, 22190358,100488243,437074150,1877449556, 7754457028,30996990781,118227838313,431216031421, 1495925257951,4946248543125,15573619100906, 46781648655093] |