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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 13 |
| 4 | 59 |
| 5 | 193 |
| 6 | 901 |
| 7 | 3271 |
| 8 | 15491 |
| 9 | 59357 |
| 10 | 283649 |
| 11 | 1126583 |
| 12 | 5423549 |
| 13 | 22084073 |
| 14 | 106895167 |
| 15 | 443477691 |
| 16 | 2155148575 |
| 17 | 9072490125 |
| 18 | 44228408951 |
| 19 | 188384093539 |
| 20 | 920685526563 |
| 21 | 3959627932739 |
| 22 | 19391369317233 |
| 23 | 84077089660291 |
| 24 | 412450227537063 |
| 25 | 1800727501511157 |
| 26 | 8846406937814897 |
| 27 | 38854506687500175 |
[1,1,5,13,59,193,901,3271,15491,59357,283649, 1126583,5423549,22084073,106895167,443477691, 2155148575,9072490125,44228408951,188384093539, 920685526563,3959627932739,19391369317233, 84077089660291,412450227537063,1800727501511157, 8846406937814897,38854506687500175] |