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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 43 |
| 4 | 175 |
| 5 | 748 |
| 6 | 3246 |
| 7 | 14398 |
| 8 | 64716 |
| 9 | 293774 |
| 10 | 1347859 |
| 11 | 6222080 |
| 12 | 28924175 |
| 13 | 135162346 |
| 14 | 634412602 |
| 15 | 2990818509 |
| 16 | 14145814414 |
| 17 | 67128767600 |
| 18 | 319445828807 |
| 19 | 1523922561901 |
| 20 | 7287166032209 |
| 21 | 34915798315777 |
| 22 | 167620183372808 |
| 23 | 806079900234919 |
| 24 | 3882523541700171 |
| 25 | 18728280768646892 |
| 26 | 90460842949248662 |
[1,3,11,43,175,748,3246,14398,64716,293774, 1347859,6222080,28924175,135162346,634412602, 2990818509,14145814414,67128767600,319445828807, 1523922561901,7287166032209,34915798315777, 167620183372808,806079900234919,3882523541700171, 18728280768646892,90460842949248662] |