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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 26 |
| 4 | 106 |
| 5 | 443 |
| 6 | 1931 |
| 7 | 8532 |
| 8 | 38556 |
| 9 | 175744 |
| 10 | 812102 |
| 11 | 3775043 |
| 12 | 17708060 |
| 13 | 83425112 |
| 14 | 395532431 |
| 15 | 1881427225 |
| 16 | 8991123869 |
| 17 | 43077291303 |
| 18 | 207115573368 |
| 19 | 997843270871 |
| 20 | 4820607972067 |
| 21 | 23327203264218 |
| 22 | 113127811678434 |
| 23 | 549380905060311 |
| 24 | 2672659561398277 |
| 25 | 13017135794651217 |
| 26 | 63491735107888927 |
| 27 | 309988267330122717 |
[1,2,7,26,106,443,1931,8532,38556,175744,812102, 3775043,17708060,83425112,395532431,1881427225, 8991123869,43077291303,207115573368,997843270871, 4820607972067,23327203264218,113127811678434, 549380905060311,2672659561398277, 13017135794651217,63491735107888927, 309988267330122717] |