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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 52 |
| 4 | 154 |
| 5 | 3824 |
| 6 | 34648 |
| 7 | 103690 |
| 8 | 3172388 |
| 9 | 30964178 |
| 10 | 98045292 |
| 11 | 3119147226 |
| 12 | 31498645552 |
| 13 | 102942841550 |
| 14 | 3339440847942 |
| 15 | 34385625760552 |
| 16 | 114418767377664 |
| 17 | 3757962051630128 |
| 18 | 39182005442010990 |
| 19 | 131941830464243716 |
[2,6,52,154,3824,34648,103690,3172388,30964178, 98045292,3119147226,31498645552,102942841550, 3339440847942,34385625760552,114418767377664, 3757962051630128,39182005442010990, 131941830464243716] |