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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 12 |
| 3 | 46 |
| 4 | 184 |
| 5 | 748 |
| 6 | 2824 |
| 7 | 10934 |
| 8 | 42474 |
| 9 | 164782 |
| 10 | 638460 |
| 11 | 2473902 |
| 12 | 9589038 |
| 13 | 37167908 |
| 14 | 144059050 |
| 15 | 558354234 |
| 16 | 2164121964 |
| 17 | 8387927204 |
| 18 | 32510787510 |
| 19 | 126008566828 |
| 20 | 488396574430 |
| 21 | 1892976376006 |
| 22 | 7336987712088 |
| 23 | 28437432700816 |
| 24 | 110220652223106 |
[1,12,46,184,748,2824,10934,42474,164782,638460, 2473902,9589038,37167908,144059050,558354234, 2164121964,8387927204,32510787510,126008566828, 488396574430,1892976376006,7336987712088, 28437432700816,110220652223106] |