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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 49 |
| 4 | 701 |
| 5 | 13177 |
| 6 | 306821 |
| 7 | 8520289 |
| 8 | 274808525 |
| 9 | 10095533833 |
| 10 | 416131518293 |
| 11 | 19017974164465 |
| 12 | 954399901374749 |
| 13 | 52173428322993433 |
| 14 | 3085965087129209381 |
| 15 | 196360349627069553793 |
| 16 | 13374490368820471936109 |
| 17 | 970904530181260115741737 |
[1,1,5,49,701,13177,306821,8520289,274808525, 10095533833,416131518293,19017974164465, 954399901374749,52173428322993433, 3085965087129209381,196360349627069553793, 13374490368820471936109,970904530181260115741737] |