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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 70 |
| 6 | 4005 |
| 7 | 219521 |
| 8 | 11954993 |
| 9 | 653625597 |
| 10 | 35989579051 |
| 11 | 1997232863281 |
| 12 | 111698425867139 |
| 13 | 6292920483661649 |
| 14 | 356957345427055439 |
| 15 | 20375264103726231304 |
| 16 | 1169732275950521805077 |
| 17 | 67508137728429209948117 |
| 18 | 3914904903283946200635048 |
| 19 | 228039200549822180269793411 |
[1,70,4005,219521,11954993,653625597,35989579051, 1997232863281,111698425867139,6292920483661649, 356957345427055439,20375264103726231304, 1169732275950521805077,67508137728429209948117, 3914904903283946200635048, 228039200549822180269793411] |