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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 13 |
| 6 | 25 |
| 7 | 44 |
| 8 | 78 |
| 9 | 136 |
| 10 | 242 |
| 11 | 422 |
| 12 | 747 |
| 13 | 1314 |
| 14 | 2326 |
| 15 | 4121 |
| 16 | 7338 |
| 17 | 13052 |
| 18 | 23288 |
| 19 | 41568 |
| 20 | 74329 |
| 21 | 133011 |
| 22 | 238338 |
| 23 | 427278 |
| 24 | 766652 |
| 25 | 1376258 |
| 26 | 2472012 |
| 27 | 4441916 |
| 28 | 7984990 |
| 29 | 14358424 |
| 30 | 25826779 |
| 31 | 46465956 |
| 32 | 83616962 |
| 33 | 150497816 |
| 34 | 270917035 |
| 35 | 487753034 |
| 36 | 878244512 |
[0,1,3,7,13,25,44,78,136,242,422,747,1314,2326, 4121,7338,13052,23288,41568,74329,133011,238338, 427278,766652,1376258,2472012,4441916,7984990, 14358424,25826779,46465956,83616962,150497816, 270917035,487753034,878244512] |