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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 11 |
| 3 | 27 |
| 4 | 85 |
| 5 | 359 |
| 6 | 1953 |
| 7 | 12907 |
| 8 | 99461 |
| 9 | 871455 |
| 10 | 8538169 |
| 11 | 92409683 |
| 12 | 1094367597 |
| 13 | 14071365511 |
| 14 | 195177925025 |
| 15 | 2904454929339 |
| 16 | 46151637341653 |
| 17 | 779850886057967 |
| 18 | 13962610118134281 |
| 19 | 264033196462146595 |
| 20 | 5258262698750606909 |
| 21 | 110001474536281307223 |
[5,11,27,85,359,1953,12907,99461,871455,8538169, 92409683,1094367597,14071365511,195177925025, 2904454929339,46151637341653,779850886057967, 13962610118134281,264033196462146595, 5258262698750606909,110001474536281307223] |