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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 36 |
| 3 | 98 |
| 4 | 358 |
| 5 | 1152 |
| 6 | 3910 |
| 7 | 12994 |
| 8 | 43596 |
| 9 | 145678 |
| 10 | 487502 |
| 11 | 1630196 |
| 12 | 5453054 |
| 13 | 18238998 |
| 14 | 61008244 |
| 15 | 204063338 |
| 16 | 682563198 |
| 17 | 2283064944 |
| 18 | 7636504950 |
| 19 | 25542956650 |
| 20 | 85437392020 |
| 21 | 285775310062 |
| 22 | 955875582398 |
| 23 | 3197260259292 |
| 24 | 10694355621414 |
[6,36,98,358,1152,3910,12994,43596,145678,487502, 1630196,5453054,18238998,61008244,204063338, 682563198,2283064944,7636504950,25542956650, 85437392020,285775310062,955875582398, 3197260259292,10694355621414] |