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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 36 |
| 3 | 164 |
| 4 | 704 |
| 5 | 2928 |
| 6 | 11968 |
| 7 | 48448 |
| 8 | 195072 |
| 9 | 783104 |
| 10 | 3138560 |
| 11 | 12567552 |
| 12 | 50298880 |
| 13 | 201256960 |
| 14 | 805158912 |
| 15 | 3220914176 |
| 16 | 12884246528 |
| 17 | 51538231296 |
| 18 | 206155546624 |
| 19 | 824627691520 |
| 20 | 3298522300416 |
| 21 | 13194113318912 |
| 22 | 52776503607296 |
[1,7,36,164,704,2928,11968,48448,195072,783104, 3138560,12567552,50298880,201256960,805158912, 3220914176,12884246528,51538231296,206155546624, 824627691520,3298522300416,13194113318912, 52776503607296] |