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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 0 |
| 2 | 4 |
| 3 | 8 |
| 4 | 14 |
| 5 | 32 |
| 6 | 60 |
| 7 | 140 |
| 8 | 212 |
| 9 | 750 |
| 10 | 1322 |
| 11 | 2540 |
| 12 | 6862 |
| 13 | 13040 |
| 14 | 27174 |
| 15 | 57052 |
| 16 | 117164 |
| 17 | 248360 |
| 18 | 555254 |
[2,0,4,8,14,32,60,140,212,750,1322,2540,6862, 13040,27174,57052,117164,248360,555254] |