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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 6 |
| 6 | 8 |
| 7 | 50 |
| 8 | 54 |
| 9 | 102 |
| 10 | 134 |
| 11 | 212 |
| 12 | 872 |
| 13 | 3055 |
| 14 | 3427 |
| 15 | 3528 |
| 16 | 4262 |
| 17 | 4414 |
| 18 | 6084 |
| 19 | 93792 |
[0,1,2,4,6,8,50,54,102,134,212,872,3055,3427,3528, 4262,4414,6084,93792] |