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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 8 |
| 4 | 14 |
| 5 | 20 |
| 6 | 90 |
| 7 | 102 |
| 8 | 154 |
| 9 | 228 |
| 10 | 310 |
| 11 | 418 |
| 12 | 554 |
| 13 | 1070 |
| 14 | 1224 |
| 15 | 3144 |
| 16 | 3996 |
| 17 | 4464 |
| 18 | 16194 |
| 19 | 17096 |
| 20 | 36642 |
| 21 | 122346 |
[2,6,8,14,20,90,102,154,228,310,418,554,1070,1224, 3144,3996,4464,16194,17096,36642,122346] |