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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 24 |
| 4 | 91 |
| 5 | 359 |
| 6 | 1460 |
| 7 | 6073 |
| 8 | 25724 |
| 9 | 110400 |
| 10 | 479215 |
| 11 | 2098947 |
| 12 | 9263894 |
| 13 | 41151657 |
| 14 | 183822696 |
| 15 | 825097254 |
| 16 | 3719217036 |
| 17 | 16827670230 |
| 18 | 76391658405 |
| 19 | 347830549447 |
| 20 | 1588043961248 |
| 21 | 7268107723868 |
| 22 | 33338818965834 |
| 23 | 153238267544708 |
| 24 | 705668594995461 |
| 25 | 3255275768507259 |
| 26 | 15040849391526707 |
| 27 | 69599290968509882 |
[1,2,7,24,91,359,1460,6073,25724,110400,479215, 2098947,9263894,41151657,183822696,825097254, 3719217036,16827670230,76391658405,347830549447, 1588043961248,7268107723868,33338818965834, 153238267544708,705668594995461,3255275768507259, 15040849391526707,69599290968509882] |