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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 11 |
| 4 | 48 |
| 5 | 188 |
| 6 | 768 |
| 7 | 3056 |
| 8 | 12288 |
| 9 | 49088 |
| 10 | 196608 |
| 11 | 786176 |
| 12 | 3145728 |
| 13 | 12581888 |
| 14 | 50331648 |
| 15 | 201322496 |
| 16 | 805306368 |
| 17 | 3221209088 |
| 18 | 12884901888 |
| 19 | 51539542016 |
| 20 | 206158430208 |
| 21 | 824633458688 |
| 22 | 3298534883328 |
| 23 | 13194138484736 |
| 24 | 52776558133248 |
[0,3,11,48,188,768,3056,12288,49088,196608,786176, 3145728,12581888,50331648,201322496,805306368, 3221209088,12884901888,51539542016,206158430208, 824633458688,3298534883328,13194138484736, 52776558133248] |