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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 8 |
| 2 | 31 |
| 3 | 105 |
| 4 | 353 |
| 5 | 1039 |
| 6 | 2961 |
| 7 | 7859 |
| 8 | 20437 |
| 9 | 53015 |
| 10 | 131605 |
| 11 | 325097 |
| 12 | 787137 |
| 13 | 1857829 |
| 14 | 4334237 |
| 15 | 10072829 |
| 16 | 23286445 |
| 17 | 52990531 |
| 18 | 120131489 |
| 19 | 270138397 |
| 20 | 601071655 |
| 21 | 1334201393 |
| 22 | 2945054825 |
| 23 | 6485229057 |
| 24 | 14277775651 |
| 25 | 31269827137 |
| 26 | 68032540043 |
| 27 | 147446383463 |
| 28 | 317906538223 |
| 29 | 683411440339 |
| 30 | 1475890477529 |
[2,8,31,105,353,1039,2961,7859,20437,53015,131605, 325097,787137,1857829,4334237,10072829,23286445, 52990531,120131489,270138397,601071655,1334201393, 2945054825,6485229057,14277775651,31269827137, 68032540043,147446383463,317906538223, 683411440339,1475890477529] |