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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 42 |
| 4 | 573 |
| 5 | 11226 |
| 6 | 294804 |
| 7 | 9946791 |
| 8 | 417064365 |
| 9 | 21187915362 |
| 10 | 1278636342660 |
| 11 | 90195692894451 |
| 12 | 7338668846348844 |
| 13 | 681052861293535251 |
| 14 | 71405270562056271741 |
| 15 | 8388541745045127600597 |
| 16 | 1096298129481068449931085 |
| 17 | 158383969954582566159384786 |
| 18 | 25153555538082783169267336764 |
[1,1,5,42,573,11226,294804,9946791,417064365, 21187915362,1278636342660,90195692894451, 7338668846348844,681052861293535251, 71405270562056271741,8388541745045127600597, 1096298129481068449931085, 158383969954582566159384786, 25153555538082783169267336764] |