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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 7 |
| 4 | 13 |
| 5 | 25 |
| 6 | 49 |
| 7 | 97 |
| 8 | 191 |
| 9 | 375 |
| 10 | 737 |
| 11 | 1449 |
| 12 | 2849 |
| 13 | 5601 |
| 14 | 11011 |
| 15 | 21647 |
| 16 | 42557 |
| 17 | 83665 |
| 18 | 164481 |
| 19 | 323361 |
| 20 | 635711 |
| 21 | 1249775 |
| 22 | 2456993 |
| 23 | 4830321 |
| 24 | 9496161 |
| 25 | 18668961 |
| 26 | 36702211 |
| 27 | 72154647 |
| 28 | 141852301 |
| 29 | 278874281 |
| 30 | 548252401 |
| 31 | 1077835841 |
| 32 | 2118969471 |
[2,4,7,13,25,49,97,191,375,737,1449,2849,5601, 11011,21647,42557,83665,164481,323361,635711, 1249775,2456993,4830321,9496161,18668961,36702211, 72154647,141852301,278874281,548252401,1077835841, 2118969471] |