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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 10 |
| 6 | 24 |
| 7 | 44 |
| 8 | 116 |
| 9 | 236 |
| 10 | 468 |
| 11 | 908 |
| 12 | 1960 |
| 13 | 3776 |
| 14 | 7812 |
| 15 | 15876 |
| 16 | 32504 |
| 17 | 63744 |
| 18 | 130104 |
[0,1,1,2,6,10,24,44,116,236,468,908,1960,3776, 7812,15876,32504,63744,130104] |