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| n | a(n) |
|---|---|
| 4 | 5 |
| 5 | 43 |
| 6 | 258 |
| 7 | 1853 |
| 8 | 15634 |
| 9 | 133697 |
| 10 | 1207256 |
| 11 | 11974457 |
| 12 | 126980013 |
| 13 | 1421291622 |
| 14 | 16925790480 |
| 15 | 213992804118 |
| 16 | 2851968574855 |
| 17 | 39996895523591 |
| 18 | 589713707701692 |
| 19 | 9114791365659163 |
| 20 | 147335664946835342 |
| 21 | 2486973983349027871 |
| 22 | 43763134470537718258 |
| 23 | 801419373432471123541 |
[5,43,258,1853,15634,133697,1207256,11974457, 126980013,1421291622,16925790480,213992804118, 2851968574855,39996895523591,589713707701692, 9114791365659163,147335664946835342, 2486973983349027871,43763134470537718258, 801419373432471123541] |