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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 63 |
| 4 | 761 |
| 5 | 11525 |
| 6 | 209539 |
| 7 | 4440527 |
| 8 | 107374753 |
| 9 | 2915352729 |
| 10 | 87771145551 |
| 11 | 2900744369039 |
| 12 | 104369641697881 |
| 13 | 4060189444664093 |
| 14 | 169777979925475531 |
| 15 | 7592652139022106975 |
| 16 | 361563242499379729537 |
| 17 | 18263719440778358953457 |
[1,1,7,63,761,11525,209539,4440527,107374753, 2915352729,87771145551,2900744369039, 104369641697881,4060189444664093, 169777979925475531,7592652139022106975, 361563242499379729537,18263719440778358953457] |