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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 3 |
| 2 | 4 |
| 3 | 7 |
| 4 | 13 |
| 5 | 25 |
| 6 | 47 |
| 7 | 88 |
| 8 | 164 |
| 9 | 306 |
| 10 | 571 |
| 11 | 1066 |
| 12 | 1990 |
| 13 | 3715 |
| 14 | 6935 |
| 15 | 12946 |
| 16 | 24167 |
| 17 | 45114 |
| 18 | 84217 |
| 19 | 157213 |
| 20 | 293479 |
| 21 | 547855 |
| 22 | 1022714 |
| 23 | 1909162 |
| 24 | 3563948 |
| 25 | 6653037 |
| 26 | 12419626 |
| 27 | 23184466 |
| 28 | 43279843 |
| 29 | 80793097 |
| 30 | 150821354 |
| 31 | 281547331 |
| 32 | 525581408 |
[2,3,4,7,13,25,47,88,164,306,571,1066,1990,3715, 6935,12946,24167,45114,84217,157213,293479,547855, 1022714,1909162,3563948,6653037,12419626,23184466, 43279843,80793097,150821354,281547331,525581408] |