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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 17 |
| 6 | 35 |
| 7 | 74 |
| 8 | 154 |
| 9 | 324 |
| 10 | 677 |
| 11 | 1422 |
| 12 | 2977 |
| 13 | 6246 |
| 14 | 13086 |
| 15 | 27444 |
| 16 | 57518 |
| 17 | 120600 |
| 18 | 252794 |
| 19 | 529994 |
| 20 | 1111013 |
| 21 | 2329187 |
| 22 | 4882755 |
| 23 | 10236280 |
| 24 | 21458943 |
| 25 | 44986461 |
| 26 | 94308415 |
| 27 | 197707134 |
| 28 | 414469000 |
| 29 | 868886834 |
| 30 | 1821517772 |
| 31 | 3818600772 |
[1,1,2,4,8,17,35,74,154,324,677,1422,2977,6246, 13086,27444,57518,120600,252794,529994,1111013, 2329187,4882755,10236280,21458943,44986461, 94308415,197707134,414469000,868886834,1821517772, 3818600772] |