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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 32 |
| 3 | 164 |
| 4 | 732 |
| 5 | 3084 |
| 6 | 12692 |
| 7 | 51604 |
| 8 | 208492 |
| 9 | 839324 |
| 10 | 3371652 |
| 11 | 13526244 |
| 12 | 54217052 |
| 13 | 217190764 |
| 14 | 869703412 |
| 15 | 3481580084 |
[1,4,32,164,732,3084,12692,51604,208492,839324, 3371652,13526244,54217052,217190764,869703412, 3481580084] |