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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 83 |
| 5 | 321 |
| 6 | 1591 |
| 7 | 6703 |
| 8 | 33373 |
| 9 | 147727 |
| 10 | 736945 |
| 11 | 3364931 |
| 12 | 16801887 |
| 13 | 78306089 |
| 14 | 391203703 |
| 15 | 1849547589 |
| 16 | 9242836257 |
| 17 | 44158627031 |
| 18 | 220716999275 |
| 19 | 1062867840851 |
| 20 | 5313123521945 |
| 21 | 25742526291623 |
| 22 | 128692783682713 |
| 23 | 626548287495809 |
| 24 | 3132411437550179 |
| 25 | 15309626547447817 |
| 26 | 76542561918362105 |
[1,1,5,17,83,321,1591,6703,33373,147727,736945, 3364931,16801887,78306089,391203703,1849547589, 9242836257,44158627031,220716999275,1062867840851, 5313123521945,25742526291623,128692783682713, 626548287495809,3132411437550179, 15309626547447817,76542561918362105] |