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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 16 |
| 3 | 152 |
| 4 | 2448 |
| 5 | 61232 |
| 6 | 2204416 |
| 7 | 108016512 |
| 8 | 6913057024 |
| 9 | 559957619456 |
| 10 | 55995761946624 |
| 11 | 6775487195543552 |
| 12 | 975670156158275584 |
| 13 | 164888256390748581888 |
| 14 | 32318098252586722066432 |
| 15 | 7271572106832012464979968 |
| 16 | 1861522459348995191034937344 |
| 17 | 537979990751859610209097023488 |
[1,3,16,152,2448,61232,2204416,108016512, 6913057024,559957619456,55995761946624, 6775487195543552,975670156158275584, 164888256390748581888,32318098252586722066432, 7271572106832012464979968, 1861522459348995191034937344, 537979990751859610209097023488] |