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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 36 |
| 3 | 114 |
| 4 | 387 |
| 5 | 1414 |
| 6 | 5302 |
| 7 | 20265 |
| 8 | 78120 |
| 9 | 302850 |
| 10 | 1177545 |
| 11 | 4587102 |
| 12 | 17888094 |
| 13 | 69803695 |
| 14 | 272499292 |
| 15 | 1064042682 |
| 16 | 4155446955 |
| 17 | 16229927982 |
| 18 | 63392825886 |
| 19 | 247616093433 |
| 20 | 967223892240 |
| 21 | 3778165401850 |
| 22 | 14758373590129 |
| 23 | 57649858583478 |
[6,36,114,387,1414,5302,20265,78120,302850, 1177545,4587102,17888094,69803695,272499292, 1064042682,4155446955,16229927982,63392825886, 247616093433,967223892240,3778165401850, 14758373590129,57649858583478] |