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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 6 |
| 4 | 8 |
| 5 | 38 |
| 6 | 66 |
| 7 | 72 |
| 8 | 126 |
| 9 | 140 |
| 10 | 152 |
| 11 | 174 |
| 12 | 332 |
| 13 | 710 |
| 14 | 820 |
| 15 | 2528 |
| 16 | 2582 |
| 17 | 2668 |
| 18 | 2776 |
| 19 | 2982 |
| 20 | 3826 |
| 21 | 6144 |
| 22 | 15778 |
| 23 | 23518 |
| 24 | 75504 |
[2,4,6,8,38,66,72,126,140,152,174,332,710,820, 2528,2582,2668,2776,2982,3826,6144,15778,23518, 75504] |