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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 2 |
| 3 | 37 |
| 4 | 127 |
| 5 | 347 |
| 6 | 1087 |
| 7 | 3109 |
| 8 | 8419 |
| 9 | 24317 |
| 10 | 64553 |
| 11 | 175211 |
| 12 | 480881 |
| 13 | 1304707 |
| 14 | 3523901 |
| 15 | 9558533 |
| 16 | 25874843 |
| 17 | 70115473 |
| 18 | 189961529 |
| 19 | 514272533 |
| 20 | 1394193607 |
| 21 | 3779851091 |
| 22 | 10246935679 |
| 23 | 27788566133 |
| 24 | 75370121191 |
| 25 | 204475052401 |
[3,2,37,127,347,1087,3109,8419,24317,64553,175211, 480881,1304707,3523901,9558533,25874843,70115473, 189961529,514272533,1394193607,3779851091, 10246935679,27788566133,75370121191,204475052401] |