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| n | a(n) |
|---|---|
| 1 | 36 |
| 2 | 186 |
| 3 | 760 |
| 4 | 2676 |
| 5 | 8688 |
| 6 | 26700 |
| 7 | 79680 |
| 8 | 232312 |
| 9 | 667992 |
| 10 | 1901728 |
| 11 | 5370088 |
| 12 | 15113368 |
| 13 | 42292140 |
| 14 | 118400480 |
| 15 | 329954824 |
| 16 | 922231524 |
| 17 | 2567058088 |
| 18 | 7179940184 |
| 19 | 20000771140 |
| 20 | 56066665316 |
| 21 | 156499989480 |
| 22 | 440143385660 |
[36,186,760,2676,8688,26700,79680,232312,667992, 1901728,5370088,15113368,42292140,118400480, 329954824,922231524,2567058088,7179940184, 20000771140,56066665316,156499989480,440143385660] |