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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 6 |
| 3 | 6 |
| 4 | 39 |
| 5 | 77 |
| 6 | 296 |
| 7 | 931 |
| 8 | 2638 |
| 9 | 8969 |
| 10 | 29941 |
| 11 | 99585 |
| 12 | 315727 |
| 13 | 1074032 |
| 14 | 3477361 |
| 15 | 11370172 |
| 16 | 37477271 |
| 17 | 122469356 |
| 18 | 399765201 |
| 19 | 1309196450 |
| 20 | 4286354555 |
| 21 | 14003095258 |
| 22 | 45836607641 |
| 23 | 149994346388 |
| 24 | 490592491099 |
| 25 | 1605187568492 |
| 26 | 5252818092741 |
[0,6,6,39,77,296,931,2638,8969,29941,99585,315727, 1074032,3477361,11370172,37477271,122469356, 399765201,1309196450,4286354555,14003095258, 45836607641,149994346388,490592491099, 1605187568492,5252818092741] |