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| n | a(n) |
|---|---|
| 1 | 25 |
| 2 | 69 |
| 3 | 177 |
| 4 | 427 |
| 5 | 1009 |
| 6 | 2339 |
| 7 | 5381 |
| 8 | 12315 |
| 9 | 28147 |
| 10 | 64367 |
| 11 | 147473 |
| 12 | 338895 |
| 13 | 781407 |
| 14 | 1808731 |
| 15 | 4202661 |
| 16 | 9803439 |
| 17 | 22952115 |
| 18 | 53927029 |
| 19 | 127112163 |
| 20 | 300515927 |
| 21 | 712369279 |
| 22 | 1692743195 |
| 23 | 4030861381 |
| 24 | 9616634755 |
| 25 | 22980554099 |
| 26 | 54994897249 |
| 27 | 131772223081 |
[25,69,177,427,1009,2339,5381,12315,28147,64367, 147473,338895,781407,1808731,4202661,9803439, 22952115,53927029,127112163,300515927,712369279, 1692743195,4030861381,9616634755,22980554099, 54994897249,131772223081] |