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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 37 |
| 5 | 181 |
| 6 | 1010 |
| 7 | 6135 |
| 8 | 40893 |
| 9 | 295753 |
| 10 | 2317683 |
| 11 | 19568427 |
| 12 | 177397551 |
| 13 | 1719790643 |
| 14 | 17767328745 |
| 15 | 194954224643 |
| 16 | 2265042428226 |
| 17 | 27785727158182 |
| 18 | 358952560098959 |
| 19 | 4871697965709175 |
| 20 | 69309502018430799 |
| 21 | 1031550920679805502 |
| 22 | 16030923441853969843 |
| 23 | 259682356008358417321 |
| 24 | 4377679648827121988375 |
[1,1,2,8,37,181,1010,6135,40893,295753,2317683, 19568427,177397551,1719790643,17767328745, 194954224643,2265042428226,27785727158182, 358952560098959,4871697965709175, 69309502018430799,1031550920679805502, 16030923441853969843,259682356008358417321, 4377679648827121988375] |