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| n | a(n) |
|---|---|
| 1 | 499 |
| 2 | 1853 |
| 3 | 13373 |
| 4 | 58800 |
| 5 | 202632 |
| 6 | 954624 |
| 7 | 4585294 |
| 8 | 18966448 |
| 9 | 80737802 |
| 10 | 366501170 |
| 11 | 1610438050 |
| 12 | 6928342996 |
| 13 | 30446045528 |
| 14 | 134338881490 |
| 15 | 586149763228 |
| 16 | 2560529857154 |
| 17 | 11241312446298 |
| 18 | 49255090317994 |
| 19 | 215425770352536 |
[499,1853,13373,58800,202632,954624,4585294, 18966448,80737802,366501170,1610438050,6928342996, 30446045528,134338881490,586149763228, 2560529857154,11241312446298,49255090317994, 215425770352536] |