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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 34 |
| 3 | 186 |
| 4 | 794 |
| 5 | 3002 |
| 6 | 10860 |
| 7 | 38768 |
| 8 | 139456 |
| 9 | 506236 |
| 10 | 1849846 |
| 11 | 6780968 |
| 12 | 24874236 |
| 13 | 91221120 |
| 14 | 334365156 |
| 15 | 1225151856 |
| 16 | 4488311694 |
| 17 | 16442040398 |
| 18 | 60232977210 |
| 19 | 220660283800 |
| 20 | 808393136582 |
| 21 | 2961592442222 |
| 22 | 10849984832400 |
| 23 | 39749595896184 |
[6,34,186,794,3002,10860,38768,139456,506236, 1849846,6780968,24874236,91221120,334365156, 1225151856,4488311694,16442040398,60232977210, 220660283800,808393136582,2961592442222, 10849984832400,39749595896184] |