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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 5 |
| 2 | 31 |
| 3 | 365 |
| 4 | 6271 |
| 5 | 129130 |
| 6 | 2877421 |
| 7 | 66628441 |
| 8 | 1578320767 |
| 9 | 37983592076 |
| 10 | 925196176906 |
| 11 | 22754692780561 |
| 12 | 564123212097901 |
| 13 | 14079691134569845 |
| 14 | 353428830512017081 |
| 15 | 8915830309096530865 |
| 16 | 225890912989184760703 |
| 17 | 5744976464242932324976 |
| 18 | 146603288011226858621356 |
[4,5,31,365,6271,129130,2877421,66628441, 1578320767,37983592076,925196176906, 22754692780561,564123212097901,14079691134569845, 353428830512017081,8915830309096530865, 225890912989184760703,5744976464242932324976, 146603288011226858621356] |