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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 6 |
| 4 | 10 |
| 5 | 102 |
| 6 | 494 |
| 7 | 794 |
| 8 | 1326 |
| 9 | 5242 |
| 10 | 5446 |
| 11 | 24602 |
| 12 | 87606 |
| 13 | 188558 |
[0,2,6,10,102,494,794,1326,5242,5446,24602,87606, 188558] |