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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 781 |
| 6 | 508431 |
| 7 | 320327931 |
| 8 | 200525284806 |
| 9 | 125368356709806 |
| 10 | 78360229974772306 |
| 11 | 48975769621072897306 |
| 12 | 30609934249224268600431 |
| 13 | 19131218685276848401412931 |
| 14 | 11957012900737114492991256681 |
| 15 | 7473133215765585192791624069181 |
| 16 | 4670708278954101902438990598678556 |
[1,781,508431,320327931,200525284806, 125368356709806,78360229974772306, 48975769621072897306,30609934249224268600431, 19131218685276848401412931, 11957012900737114492991256681, 7473133215765585192791624069181, 4670708278954101902438990598678556] |