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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 27 |
| 3 | 114 |
| 4 | 468 |
| 5 | 1896 |
| 6 | 7632 |
| 7 | 30624 |
| 8 | 122688 |
| 9 | 491136 |
| 10 | 1965312 |
| 11 | 7862784 |
| 12 | 31454208 |
| 13 | 125822976 |
| 14 | 503304192 |
| 15 | 2013241344 |
| 16 | 8053014528 |
| 17 | 32212156416 |
| 18 | 128848822272 |
| 19 | 515395682304 |
| 20 | 2061583515648 |
| 21 | 8246335635456 |
| 22 | 32985345687552 |
[1,6,27,114,468,1896,7632,30624,122688,491136, 1965312,7862784,31454208,125822976,503304192, 2013241344,8053014528,32212156416,128848822272, 515395682304,2061583515648,8246335635456, 32985345687552] |