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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 6 |
| 4 | 9 |
| 5 | 14 |
| 6 | 18 |
| 7 | 25 |
| 8 | 32 |
| 9 | 44 |
| 10 | 63 |
| 11 | 86 |
| 12 | 126 |
| 13 | 185 |
| 14 | 276 |
| 15 | 424 |
| 16 | 663 |
| 17 | 1046 |
| 18 | 1658 |
| 19 | 2651 |
| 20 | 4252 |
| 21 | 6838 |
| 22 | 11025 |
| 23 | 17794 |
| 24 | 28746 |
| 25 | 46465 |
| 26 | 75126 |
| 27 | 121496 |
| 28 | 196525 |
| 29 | 317920 |
| 30 | 514342 |
| 31 | 832167 |
| 32 | 1346400 |
| 33 | 2178446 |
| 34 | 3524717 |
| 35 | 5703036 |
| 36 | 9227616 |
| 37 | 14930509 |
| 38 | 24157980 |
| 39 | 39088336 |
[2,4,6,9,14,18,25,32,44,63,86,126,185,276,424,663, 1046,1658,2651,4252,6838,11025,17794,28746,46465, 75126,121496,196525,317920,514342,832167,1346400, 2178446,3524717,5703036,9227616,14930509,24157980, 39088336] |