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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 35 |
| 5 | 379 |
| 6 | 4969 |
| 7 | 81605 |
| 8 | 1570715 |
| 9 | 35014891 |
| 10 | 882837361 |
| 11 | 24895264085 |
| 12 | 775645354835 |
| 13 | 26471069590939 |
| 14 | 981882918161209 |
| 15 | 39334966906021925 |
| 16 | 1692480890859290315 |
| 17 | 77845165565219861131 |
| 18 | 3811434080897211664321 |
| 19 | 197923606218617044173365 |
[1,1,5,35,379,4969,81605,1570715,35014891, 882837361,24895264085,775645354835,26471069590939, 981882918161209,39334966906021925, 1692480890859290315,77845165565219861131, 3811434080897211664321,197923606218617044173365] |