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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 11 |
| 2 | 25 |
| 3 | 61 |
| 4 | 147 |
| 5 | 355 |
| 6 | 857 |
| 7 | 2069 |
| 8 | 4995 |
| 9 | 12059 |
| 10 | 29113 |
| 11 | 70285 |
| 12 | 169683 |
| 13 | 409651 |
| 14 | 988985 |
| 15 | 2387621 |
| 16 | 5764227 |
| 17 | 13916075 |
| 18 | 33596377 |
| 19 | 81108829 |
| 20 | 195814035 |
| 21 | 472736899 |
| 22 | 1141287833 |
| 23 | 2755312565 |
| 24 | 6651912963 |
| 25 | 16059138491 |
| 26 | 38770189945 |
| 27 | 93599518381 |
[3,11,25,61,147,355,857,2069,4995,12059,29113, 70285,169683,409651,988985,2387621,5764227, 13916075,33596377,81108829,195814035,472736899, 1141287833,2755312565,6651912963,16059138491, 38770189945,93599518381] |