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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 5 |
| 6 | 16 |
| 7 | 37 |
| 8 | 83 |
| 9 | 178 |
| 10 | 374 |
| 11 | 772 |
| 12 | 1565 |
| 13 | 3160 |
| 14 | 6361 |
| 15 | 12770 |
| 16 | 25599 |
| 17 | 51265 |
| 18 | 102634 |
| 19 | 205374 |
| 20 | 410873 |
| 21 | 821924 |
| 22 | 1644070 |
| 23 | 3288433 |
| 24 | 6577231 |
| 25 | 13154868 |
| 26 | 26310347 |
| 27 | 52621521 |
| 28 | 105244142 |
| 29 | 210489792 |
| 30 | 420981295 |
| 31 | 841964929 |
| 32 | 1683933254 |
| 33 | 3367871086 |
| 34 | 6735748322 |
| 35 | 13471504796 |
| 36 | 26943020642 |
[1,5,16,37,83,178,374,772,1565,3160,6361,12770, 25599,51265,102634,205374,410873,821924,1644070, 3288433,6577231,13154868,26310347,52621521, 105244142,210489792,420981295,841964929, 1683933254,3367871086,6735748322,13471504796, 26943020642] |