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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 9 |
| 4 | 29 |
| 5 | 81 |
| 6 | 265 |
| 7 | 881 |
| 8 | 3065 |
| 9 | 10897 |
| 10 | 39533 |
| 11 | 145561 |
| 12 | 542645 |
| 13 | 2043745 |
| 14 | 7764497 |
| 15 | 29719521 |
| 16 | 114495985 |
| 17 | 443623521 |
| 18 | 1727552085 |
| 19 | 6757763753 |
| 20 | 26541775821 |
| 21 | 104626427441 |
| 22 | 413800025625 |
| 23 | 1641535159889 |
| 24 | 6529945089769 |
| 25 | 26041812710001 |
[1,1,5,9,29,81,265,881,3065,10897,39533,145561, 542645,2043745,7764497,29719521,114495985, 443623521,1727552085,6757763753,26541775821, 104626427441,413800025625,1641535159889, 6529945089769,26041812710001] |