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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 5 |
| 4 | 9 |
| 5 | 23 |
| 6 | 676 |
| 7 | 1375 |
| 8 | 2051 |
| 9 | 3426 |
| 10 | 12329 |
| 11 | 15755 |
| 12 | 926119 |
| 13 | 941874 |
| 14 | 3751741 |
| 15 | 4693615 |
| 16 | 8445356 |
| 17 | 21584327 |
| 18 | 634390839 |
| 19 | 1290366005 |
| 20 | 1924756844 |
| 21 | 3215122849 |
| 22 | 11570125391 |
| 23 | 14785248240 |
| 24 | 869114523311 |
| 25 | 883899771551 |
| 26 | 3520813837964 |
| 27 | 4404713609515 |
| 28 | 7925527447479 |
[1,1,4,5,9,23,676,1375,2051,3426,12329,15755, 926119,941874,3751741,4693615,8445356,21584327, 634390839,1290366005,1924756844,3215122849, 11570125391,14785248240,869114523311,883899771551, 3520813837964,4404713609515,7925527447479] |