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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 35 |
| 4 | 157 |
| 5 | 713 |
| 6 | 3263 |
| 7 | 14895 |
| 8 | 68101 |
| 9 | 311509 |
| 10 | 1424689 |
| 11 | 6516312 |
| 12 | 29807450 |
| 13 | 136351053 |
| 14 | 623728103 |
| 15 | 2853225545 |
| 16 | 13052077767 |
| 17 | 59706884718 |
| 18 | 273130241113 |
| 19 | 1249440509707 |
| 20 | 5715597380517 |
| 21 | 26146153523610 |
| 22 | 119606300969406 |
[3,7,35,157,713,3263,14895,68101,311509,1424689, 6516312,29807450,136351053,623728103,2853225545, 13052077767,59706884718,273130241113, 1249440509707,5715597380517,26146153523610, 119606300969406] |