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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 24 |
| 5 | 225 |
| 6 | 2489 |
| 7 | 32326 |
| 8 | 483968 |
| 9 | 8211543 |
| 10 | 155740501 |
| 11 | 3265307342 |
| 12 | 74995101843 |
| 13 | 1872508994356 |
| 14 | 50500982610620 |
| 15 | 1463062187672336 |
| 16 | 45314261742435296 |
| 17 | 1494164679669072424 |
| 18 | 52257665502536426741 |
| 19 | 1932255827699763531474 |
| 20 | 75312621088768346098203 |
[1,3,24,225,2489,32326,483968,8211543,155740501, 3265307342,74995101843,1872508994356, 50500982610620,1463062187672336,45314261742435296, 1494164679669072424,52257665502536426741, 1932255827699763531474,75312621088768346098203] |