| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 55 |
| 4 | 10147 |
| 5 | 22069251 |
| 6 | 602351808741 |
| 7 | 215298243454580553 |
| 8 | 1035075803117199670120995 |
| 9 | 68263787608482538080643047338467 |
| 10 | 62721314697296961151225820176430830979953 |
[1,3,55,10147,22069251,602351808741, 215298243454580553,1035075803117199670120995, 68263787608482538080643047338467, 62721314697296961151225820176430830979953] |