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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 13 |
| 4 | 31 |
| 5 | 85 |
| 6 | 199 |
| 7 | 493 |
| 8 | 1231 |
| 9 | 3013 |
| 10 | 7447 |
| 11 | 18397 |
| 12 | 45343 |
| 13 | 111925 |
| 14 | 276199 |
| 15 | 681421 |
| 16 | 1681519 |
| 17 | 4149157 |
| 18 | 10237879 |
| 19 | 25262269 |
| 20 | 62334655 |
| 21 | 153810709 |
| 22 | 379529095 |
| 23 | 936489133 |
| 24 | 2310790159 |
| 25 | 5701884805 |
| 26 | 14069421655 |
| 27 | 34716351901 |
| 28 | 85662734431 |
| 29 | 211373124853 |
| 30 | 521564001319 |
[1,7,13,31,85,199,493,1231,3013,7447,18397,45343, 111925,276199,681421,1681519,4149157,10237879, 25262269,62334655,153810709,379529095,936489133, 2310790159,5701884805,14069421655,34716351901, 85662734431,211373124853,521564001319] |