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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 33 |
| 4 | 145 |
| 5 | 660 |
| 6 | 3070 |
| 7 | 14511 |
| 8 | 69333 |
| 9 | 334079 |
| 10 | 1619791 |
| 11 | 7892499 |
| 12 | 38606071 |
| 13 | 189434359 |
| 14 | 931906421 |
| 15 | 4594112238 |
| 16 | 22687930940 |
| 17 | 112209639076 |
| 18 | 555661162474 |
| 19 | 2754576110087 |
| 20 | 13667816994863 |
| 21 | 67871749544977 |
| 22 | 337271248514160 |
| 23 | 1676996069410049 |
| 24 | 8342863297256909 |
| 25 | 41524199235081691 |
| 26 | 206760272344245310 |
[1,2,8,33,145,660,3070,14511,69333,334079,1619791, 7892499,38606071,189434359,931906421,4594112238, 22687930940,112209639076,555661162474, 2754576110087,13667816994863,67871749544977, 337271248514160,1676996069410049,8342863297256909, 41524199235081691,206760272344245310] |