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| n | a(n) |
|---|---|
| 12 | 1 |
| 13 | 6 |
| 14 | 26 |
| 15 | 91 |
| 16 | 273 |
| 17 | 728 |
| 18 | 1768 |
| 19 | 3978 |
| 20 | 8398 |
| 21 | 16796 |
| 22 | 32065 |
| 23 | 58786 |
| 24 | 104006 |
| 25 | 178296 |
| 26 | 297160 |
| 27 | 482885 |
| 28 | 766935 |
| 29 | 1193010 |
| 30 | 1820910 |
| 31 | 2731365 |
| 32 | 4032015 |
| 33 | 5864749 |
| 34 | 8414640 |
| 35 | 11920740 |
| 36 | 16689036 |
| 37 | 23107896 |
| 38 | 31666376 |
| 39 | 42975796 |
[1,6,26,91,273,728,1768,3978,8398,16796,32065, 58786,104006,178296,297160,482885,766935,1193010, 1820910,2731365,4032015,5864749,8414640,11920740, 16689036,23107896,31666376,42975796] |