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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 39 |
| 4 | 205 |
| 5 | 1136 |
| 6 | 6548 |
| 7 | 38882 |
| 8 | 236260 |
| 9 | 1462131 |
| 10 | 9184413 |
| 11 | 58408588 |
| 12 | 375330536 |
| 13 | 2433325315 |
| 14 | 15896742423 |
| 15 | 104546968252 |
| 16 | 691608993478 |
| 17 | 4599024778431 |
| 18 | 30724413312953 |
| 19 | 206114347293697 |
| 20 | 1387917616331135 |
| 21 | 9377747277136328 |
[1,2,8,39,205,1136,6548,38882,236260,1462131, 9184413,58408588,375330536,2433325315,15896742423, 104546968252,691608993478,4599024778431, 30724413312953,206114347293697,1387917616331135, 9377747277136328] |