| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 45 |
| 3 | 500 |
| 4 | 6200 |
| 5 | 82251 |
| 6 | 1142295 |
| 7 | 16398200 |
| 8 | 241379325 |
| 9 | 3623534200 |
| 10 | 55262073757 |
| 11 | 853814730600 |
| 12 | 13335836817420 |
| 13 | 210225027967325 |
| 14 | 3340362288091500 |
| 15 | 53443628421286320 |
| 16 | 860246972339613855 |
| 17 | 13921016318025200505 |
| 18 | 226352372251889455000 |
| 19 | 3696160728052814340000 |
[1,5,45,500,6200,82251,1142295,16398200,241379325, 3623534200,55262073757,853814730600, 13335836817420,210225027967325,3340362288091500, 53443628421286320,860246972339613855, 13921016318025200505,226352372251889455000, 3696160728052814340000] |