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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 41 |
| 3 | 301 |
| 4 | 2513 |
| 5 | 20181 |
| 6 | 170745 |
| 7 | 1423101 |
| 8 | 12161441 |
| 9 | 103344037 |
| 10 | 889924553 |
| 11 | 7650373325 |
| 12 | 66271512433 |
| 13 | 574065261173 |
| 14 | 4996181205657 |
| 15 | 43511277885597 |
| 16 | 380108373809985 |
| 17 | 3323551100483397 |
| 18 | 29122753514303337 |
| 19 | 255427680480306285 |
| 20 | 2243831648555990289 |
| 21 | 19728657265135701525 |
[1,5,41,301,2513,20181,170745,1423101,12161441, 103344037,889924553,7650373325,66271512433, 574065261173,4996181205657,43511277885597, 380108373809985,3323551100483397, 29122753514303337,255427680480306285, 2243831648555990289,19728657265135701525] |