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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 32 |
| 3 | 164 |
| 4 | 732 |
| 5 | 3108 |
| 6 | 12884 |
| 7 | 52364 |
| 8 | 211044 |
| 9 | 847436 |
| 10 | 3396804 |
| 11 | 13603244 |
| 12 | 54451044 |
| 13 | 217898636 |
| 14 | 871838724 |
| 15 | 3488009324 |
[1,4,32,164,732,3108,12884,52364,211044,847436, 3396804,13603244,54451044,217898636,871838724, 3488009324] |