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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 29 |
| 4 | 141 |
| 5 | 518 |
| 6 | 2559 |
| 7 | 10010 |
| 8 | 49737 |
| 9 | 201902 |
| 10 | 1006037 |
| 11 | 4186127 |
| 12 | 20888571 |
| 13 | 88476550 |
| 14 | 441843335 |
| 15 | 1896865677 |
| 16 | 9477117035 |
| 17 | 41119442928 |
| 18 | 205497571867 |
| 19 | 899303209251 |
| 20 | 4495102858063 |
| 21 | 19812021068060 |
| 22 | 99039630904031 |
| 23 | 439142783921982 |
| 24 | 2195411967657091 |
| 25 | 9784682586251586 |
| 26 | 48918892448735361 |
[1,2,9,29,141,518,2559,10010,49737,201902,1006037, 4186127,20888571,88476550,441843335,1896865677, 9477117035,41119442928,205497571867,899303209251, 4495102858063,19812021068060,99039630904031, 439142783921982,2195411967657091,9784682586251586, 48918892448735361] |