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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 109 |
| 5 | 557 |
| 6 | 5785 |
| 7 | 47357 |
| 8 | 596365 |
| 9 | 7151841 |
| 10 | 106763725 |
| 11 | 1622633597 |
| 12 | 28757539337 |
| 13 | 526858352477 |
| 14 | 10758375762109 |
| 15 | 230342261913169 |
| 16 | 5344946955452877 |
| 17 | 130370767029201437 |
| 18 | 3394996816992588345 |
| 19 | 92801587319328673277 |
| 20 | 2681375183085608280093 |
[1,5,17,109,557,5785,47357,596365,7151841, 106763725,1622633597,28757539337,526858352477, 10758375762109,230342261913169,5344946955452877, 130370767029201437,3394996816992588345, 92801587319328673277,2681375183085608280093] |