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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 42 |
| 2 | 902 |
| 3 | 13201 |
| 4 | 148049 |
| 5 | 1356565 |
| 6 | 10574431 |
| 7 | 72096080 |
| 8 | 438720787 |
| 9 | 2419697247 |
| 10 | 12242381349 |
| 11 | 57373851187 |
| 12 | 251050546012 |
| 13 | 1032501499239 |
| 14 | 4013670296068 |
| 15 | 14818423396369 |
| 16 | 52176735277287 |
| 17 | 175849530836635 |
| 18 | 569087907675698 |
[1,42,902,13201,148049,1356565,10574431,72096080, 438720787,2419697247,12242381349,57373851187, 251050546012,1032501499239,4013670296068, 14818423396369,52176735277287,175849530836635, 569087907675698] |