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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 22 |
| 4 | 68 |
| 5 | 217 |
| 6 | 683 |
| 7 | 2163 |
| 8 | 6837 |
| 9 | 21623 |
| 10 | 68377 |
| 11 | 216228 |
| 12 | 683772 |
| 13 | 2162278 |
| 14 | 6837722 |
| 15 | 21622777 |
| 16 | 68377223 |
| 17 | 216227767 |
| 18 | 683772233 |
| 19 | 2162277661 |
| 20 | 6837722339 |
| 21 | 21622776602 |
| 22 | 68377223398 |
| 23 | 216227766017 |
| 24 | 683772233983 |
| 25 | 2162277660169 |
[4,6,22,68,217,683,2163,6837,21623,68377,216228, 683772,2162278,6837722,21622777,68377223, 216227767,683772233,2162277661,6837722339, 21622776602,68377223398,216227766017,683772233983, 2162277660169] |