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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 16 |
| 3 | 45 |
| 4 | 129 |
| 5 | 373 |
| 6 | 1083 |
| 7 | 3148 |
| 8 | 9157 |
| 9 | 26623 |
| 10 | 77372 |
| 11 | 224857 |
| 12 | 653525 |
| 13 | 1899462 |
| 14 | 5520787 |
| 15 | 16046124 |
| 16 | 46637722 |
| 17 | 135551305 |
| 18 | 393976458 |
| 19 | 1145083415 |
| 20 | 3328158969 |
| 21 | 9673218248 |
| 22 | 28114986916 |
| 23 | 81715561920 |
| 24 | 237504397813 |
| 25 | 690301064559 |
[5,16,45,129,373,1083,3148,9157,26623,77372, 224857,653525,1899462,5520787,16046124,46637722, 135551305,393976458,1145083415,3328158969, 9673218248,28114986916,81715561920,237504397813, 690301064559] |