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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 52 |
| 3 | 658 |
| 4 | 7600 |
| 5 | 83194 |
| 6 | 882352 |
| 7 | 9176458 |
| 8 | 94235200 |
| 9 | 959646394 |
| 10 | 9717524752 |
| 11 | 98022673258 |
| 12 | 986158712800 |
| 13 | 9903110989594 |
| 14 | 99321776927152 |
| 15 | 995252438490058 |
| 16 | 9966767069430400 |
| 17 | 99767369486012794 |
| 18 | 998371586402089552 |
[1,4,52,658,7600,83194,882352,9176458,94235200, 959646394,9717524752,98022673258,986158712800, 9903110989594,99321776927152,995252438490058, 9966767069430400,99767369486012794, 998371586402089552] |