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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 16 |
| 3 | 83 |
| 4 | 416 |
| 5 | 2083 |
| 6 | 10416 |
| 7 | 52083 |
| 8 | 260416 |
| 9 | 1302083 |
| 10 | 6510416 |
| 11 | 32552083 |
| 12 | 162760416 |
| 13 | 813802083 |
| 14 | 4069010416 |
| 15 | 20345052083 |
| 16 | 101725260416 |
| 17 | 508626302083 |
| 18 | 2543131510416 |
| 19 | 12715657552083 |
| 20 | 63578287760416 |
| 21 | 317891438802083 |
[3,16,83,416,2083,10416,52083,260416,1302083, 6510416,32552083,162760416,813802083,4069010416, 20345052083,101725260416,508626302083, 2543131510416,12715657552083,63578287760416, 317891438802083] |