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| n | a(n) |
|---|---|
| -1 | 2 |
| 0 | 8 |
| 1 | 42 |
| 2 | 248 |
| 3 | 1442 |
| 4 | 8408 |
| 5 | 49002 |
| 6 | 285608 |
| 7 | 1664642 |
| 8 | 9702248 |
| 9 | 56548842 |
| 10 | 329590808 |
| 11 | 1920996002 |
| 12 | 11196385208 |
| 13 | 65257315242 |
| 14 | 380347506248 |
| 15 | 2216827722242 |
| 16 | 12920618827208 |
| 17 | 75306885241002 |
| 18 | 438920692618808 |
| 19 | 2558217270471842 |
| 20 | 14910382930212248 |
| 21 | 86904080310801642 |
| 22 | 506514098934597608 |
[2,8,42,248,1442,8408,49002,285608,1664642, 9702248,56548842,329590808,1920996002,11196385208, 65257315242,380347506248,2216827722242, 12920618827208,75306885241002,438920692618808, 2558217270471842,14910382930212248, 86904080310801642,506514098934597608] |