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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 4 |
| 2 | 7 |
| 3 | 14 |
| 4 | 87 |
| 5 | 110 |
| 6 | 178 |
| 7 | 1551 |
| 8 | 2311 |
| 9 | 2820 |
| 10 | 2862 |
| 11 | 5158 |
| 12 | 9267 |
| 13 | 15867 |
| 14 | 25023 |
| 15 | 34363 |
| 16 | 68486 |
| 17 | 2570490 |
| 18 | 4313372 |
| 19 | 21511363 |
| 20 | 22412883 |
| 21 | 54933234 |
| 22 | 66947210 |
| 23 | 341535842 |
| 24 | 995434171 |
| 25 | 1491645143 |
| 26 | 4258696422 |
| 27 | 26212684635 |
| 28 | 28500533228 |
[2,4,7,14,87,110,178,1551,2311,2820,2862,5158, 9267,15867,25023,34363,68486,2570490,4313372, 21511363,22412883,54933234,66947210,341535842, 995434171,1491645143,4258696422,26212684635, 28500533228] |