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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 9 |
| 4 | 37 |
| 5 | 89 |
| 6 | 325 |
| 7 | 905 |
| 8 | 3109 |
| 9 | 9337 |
| 10 | 31173 |
| 11 | 97449 |
| 12 | 321445 |
| 13 | 1027225 |
| 14 | 3374405 |
| 15 | 10920649 |
| 16 | 35855909 |
| 17 | 116937145 |
| 18 | 384340421 |
| 19 | 1259728873 |
| 20 | 4147000229 |
| 21 | 13639616473 |
| 22 | 44978045765 |
| 23 | 148314302473 |
| 24 | 489879442469 |
| 25 | 1618600915705 |
[1,1,5,9,37,89,325,905,3109,9337,31173,97449, 321445,1027225,3374405,10920649,35855909, 116937145,384340421,1259728873,4147000229, 13639616473,44978045765,148314302473,489879442469, 1618600915705] |