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| n | a(n) |
|---|---|
| 1 | 31 |
| 2 | 307 |
| 3 | 643 |
| 4 | 5113 |
| 5 | 21787 |
| 6 | 39199 |
| 7 | 360007 |
| 8 | 360007 |
| 9 | 4775569 |
| 10 | 10318249 |
| 11 | 10318249 |
| 12 | 65139031 |
| 13 | 387453811 |
| 14 | 913900417 |
| 15 | 2278522747 |
| 16 | 2741702809 |
| 17 | 25147657981 |
| 18 | 118748663779 |
| 19 | 156776294593 |
| 20 | 747206701687 |
| 21 | 1151810360731 |
| 22 | 1151810360731 |
| 23 | 1151810360731 |
[31,307,643,5113,21787,39199,360007,360007, 4775569,10318249,10318249,65139031,387453811, 913900417,2278522747,2741702809,25147657981, 118748663779,156776294593,747206701687, 1151810360731,1151810360731,1151810360731] |