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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 15 |
| 4 | 29 |
| 5 | 95 |
| 6 | 255 |
| 7 | 747 |
| 8 | 2215 |
| 9 | 6649 |
| 10 | 19967 |
| 11 | 60145 |
| 12 | 182003 |
| 13 | 554625 |
| 14 | 1691547 |
| 15 | 5175093 |
| 16 | 15875649 |
| 17 | 48789933 |
| 18 | 150258301 |
| 19 | 463501341 |
| 20 | 1431832723 |
| 21 | 4429155217 |
| 22 | 13716674493 |
| 23 | 42524970155 |
| 24 | 131966196475 |
| 25 | 409893633219 |
| 26 | 1274208141011 |
[1,3,15,29,95,255,747,2215,6649,19967,60145, 182003,554625,1691547,5175093,15875649,48789933, 150258301,463501341,1431832723,4429155217, 13716674493,42524970155,131966196475,409893633219, 1274208141011] |