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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 17 |
| 2 | 105 |
| 3 | 701 |
| 4 | 4977 |
| 5 | 36917 |
| 6 | 281865 |
| 7 | 2191661 |
| 8 | 17233377 |
| 9 | 136432997 |
| 10 | 1084556025 |
| 11 | 8642957021 |
| 12 | 68980394577 |
| 13 | 551043625877 |
| 14 | 4404418462185 |
| 15 | 35215963408781 |
| 16 | 281631859568577 |
| 17 | 2252579933007557 |
| 18 | 18018281926224345 |
| 19 | 144134536440090941 |
[3,17,105,701,4977,36917,281865,2191661,17233377, 136432997,1084556025,8642957021,68980394577, 551043625877,4404418462185,35215963408781, 281631859568577,2252579933007557, 18018281926224345,144134536440090941] |