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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 15 |
| 4 | 79 |
| 5 | 425 |
| 6 | 2317 |
| 7 | 12749 |
| 8 | 70631 |
| 9 | 393379 |
| 10 | 2200203 |
| 11 | 12348645 |
| 12 | 69507969 |
| 13 | 392211153 |
| 14 | 2217824883 |
| 15 | 12564291759 |
| 16 | 71294454543 |
| 17 | 405135974649 |
| 18 | 2305189276605 |
| 19 | 13131574749357 |
| 20 | 74883034577575 |
| 21 | 427430124521651 |
| 22 | 2441889639394043 |
| 23 | 13961588736578245 |
| 24 | 79884779408549249 |
[1,3,15,79,425,2317,12749,70631,393379,2200203, 12348645,69507969,392211153,2217824883, 12564291759,71294454543,405135974649, 2305189276605,13131574749357,74883034577575, 427430124521651,2441889639394043, 13961588736578245,79884779408549249] |