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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 21 |
| 3 | 303 |
| 4 | 7581 |
| 5 | 291903 |
| 6 | 16004541 |
| 7 | 11842303 |
| 8 | 113649275901 |
| 9 | 13729560793503 |
| 10 | 2038432934681661 |
| 11 | 364819653173167503 |
| 12 | 77453921498088781821 |
| 13 | 19245815560568454066303 |
| 14 | 5532998260944453966936381 |
[1,3,21,303,7581,291903,16004541,11842303, 113649275901,13729560793503,2038432934681661, 364819653173167503,77453921498088781821, 19245815560568454066303,5532998260944453966936381] |