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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 2 |
| 3 | 2 |
| 4 | 2 |
| 5 | 6 |
| 6 | 8 |
| 7 | 16 |
| 8 | 26 |
| 9 | 44 |
| 10 | 88 |
| 11 | 160 |
| 12 | 318 |
| 13 | 620 |
| 14 | 1234 |
| 15 | 2434 |
| 16 | 4860 |
| 17 | 9664 |
| 18 | 19282 |
| 19 | 38450 |
| 20 | 76804 |
| 21 | 153362 |
| 22 | 306524 |
| 23 | 612576 |
| 24 | 1224770 |
| 25 | 2448594 |
| 26 | 4896428 |
| 27 | 9790988 |
| 28 | 19580486 |
| 29 | 39157180 |
| 30 | 78311372 |
| 31 | 156615316 |
| 32 | 313224766 |
| 33 | 626434456 |
| 34 | 1252857082 |
| 35 | 2505684038 |
| 36 | 5011344512 |
[2,2,2,2,6,8,16,26,44,88,160,318,620,1234,2434, 4860,9664,19282,38450,76804,153362,306524,612576, 1224770,2448594,4896428,9790988,19580486,39157180, 78311372,156615316,313224766,626434456,1252857082, 2505684038,5011344512] |