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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 12 |
| 3 | 45 |
| 4 | 174 |
| 5 | 675 |
| 6 | 2607 |
| 7 | 10077 |
| 8 | 38967 |
| 9 | 150651 |
| 10 | 582435 |
| 11 | 2251827 |
| 12 | 8706015 |
| 13 | 33659139 |
| 14 | 130132935 |
| 15 | 503119779 |
| 16 | 1945160703 |
| 17 | 7520376939 |
| 18 | 29075268471 |
| 19 | 112410752211 |
| 20 | 434602254687 |
| 21 | 1680258482619 |
| 22 | 6496212425799 |
| 23 | 25115645192451 |
| 24 | 97102063806447 |
[2,12,45,174,675,2607,10077,38967,150651,582435, 2251827,8706015,33659139,130132935,503119779, 1945160703,7520376939,29075268471,112410752211, 434602254687,1680258482619,6496212425799, 25115645192451,97102063806447] |