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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 6 |
| 2 | 12 |
| 3 | 32 |
| 4 | 94 |
| 5 | 534 |
| 6 | 2556 |
| 7 | 8062 |
| 8 | 35138 |
| 9 | 119094 |
| 10 | 293692 |
| 11 | 696532 |
| 12 | 1592106 |
| 13 | 3788448 |
| 14 | 10393730 |
[4,6,12,32,94,534,2556,8062,35138,119094,293692, 696532,1592106,3788448,10393730] |