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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 36 |
| 4 | 157 |
| 5 | 710 |
| 6 | 3257 |
| 7 | 15115 |
| 8 | 71008 |
| 9 | 336214 |
| 10 | 1599507 |
| 11 | 7650782 |
| 12 | 36747858 |
| 13 | 177037977 |
| 14 | 855315890 |
| 15 | 4142700612 |
| 16 | 20105493813 |
| 17 | 97750570368 |
| 18 | 476036133721 |
| 19 | 2321534199609 |
| 20 | 11335833550603 |
| 21 | 55415731236055 |
| 22 | 271183822714642 |
| 23 | 1328308300376693 |
| 24 | 6511887399486650 |
| 25 | 31949044841913435 |
| 26 | 156863573594043375 |
[1,2,9,36,157,710,3257,15115,71008,336214,1599507, 7650782,36747858,177037977,855315890,4142700612, 20105493813,97750570368,476036133721, 2321534199609,11335833550603,55415731236055, 271183822714642,1328308300376693,6511887399486650, 31949044841913435,156863573594043375] |