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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 73 |
| 5 | 305 |
| 6 | 1357 |
| 7 | 6113 |
| 8 | 28241 |
| 9 | 132257 |
| 10 | 628181 |
| 11 | 3015281 |
| 12 | 14611481 |
| 13 | 71367505 |
| 14 | 351026077 |
| 15 | 1737069249 |
| 16 | 8642422689 |
| 17 | 43204965953 |
| 18 | 216918504613 |
| 19 | 1093299119057 |
| 20 | 5529714637545 |
| 21 | 28057603921521 |
| 22 | 142778662494957 |
| 23 | 728511386126497 |
| 24 | 3726298158066673 |
| 25 | 19103173934709985 |
| 26 | 98140344111905909 |
| 27 | 505171574309714993 |
| 28 | 2605081666723574969 |
| 29 | 13456821571101555345 |
| 30 | 69623363954847218493 |
[1,1,5,17,73,305,1357,6113,28241,132257,628181, 3015281,14611481,71367505,351026077,1737069249, 8642422689,43204965953,216918504613,1093299119057, 5529714637545,28057603921521,142778662494957, 728511386126497,3726298158066673, 19103173934709985,98140344111905909, 505171574309714993,2605081666723574969, 13456821571101555345,69623363954847218493] |