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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 26 |
| 4 | 118 |
| 5 | 438 |
| 6 | 2068 |
| 7 | 8171 |
| 8 | 39304 |
| 9 | 161039 |
| 10 | 782876 |
| 11 | 3285331 |
| 12 | 16076106 |
| 13 | 68622980 |
| 14 | 337263559 |
| 15 | 1458225675 |
| 16 | 7188944802 |
| 17 | 31396103454 |
| 18 | 155132880839 |
| 19 | 683008513890 |
| 20 | 3380704776910 |
| 21 | 14984027275167 |
| 22 | 74267689980629 |
| 23 | 331024622361136 |
| 24 | 1642498589303570 |
| 25 | 7356132795528232 |
| 26 | 36532652562210368 |
| 27 | 164297081136379295 |
[1,2,8,26,118,438,2068,8171,39304,161039,782876, 3285331,16076106,68622980,337263559,1458225675, 7188944802,31396103454,155132880839,683008513890, 3380704776910,14984027275167,74267689980629, 331024622361136,1642498589303570,7356132795528232, 36532652562210368,164297081136379295] |