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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 3 |
| 2 | 5 |
| 3 | 11 |
| 4 | 29 |
| 5 | 97 |
| 6 | 347 |
| 7 | 1429 |
| 8 | 6229 |
| 9 | 29873 |
| 10 | 160869 |
| 11 | 895680 |
| 12 | 5448207 |
| 13 | 34885543 |
| 14 | 228759799 |
| 15 | 1568298164 |
| 16 | 11417382972 |
| 17 | 87698582661 |
| 18 | 684947826800 |
| 19 | 5606539592683 |
| 20 | 47241542317190 |
| 21 | 403631914492643 |
| 22 | 3587558929043911 |
| 23 | 32684217334320604 |
| 24 | 308342289648017960 |
| 25 | 3036819365023555974 |
[2,3,5,11,29,97,347,1429,6229,29873,160869,895680, 5448207,34885543,228759799,1568298164,11417382972, 87698582661,684947826800,5606539592683, 47241542317190,403631914492643,3587558929043911, 32684217334320604,308342289648017960, 3036819365023555974] |