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| n | a(n) |
|---|---|
| 2 | 7 |
| 3 | 37 |
| 4 | 271 |
| 5 | 2269 |
| 6 | 19927 |
| 7 | 177877 |
| 8 | 1596511 |
| 9 | 14355469 |
| 10 | 129159847 |
| 11 | 1162320517 |
| 12 | 10460530351 |
| 13 | 94143710269 |
| 14 | 847290203767 |
| 15 | 7625602267957 |
| 16 | 68630391713791 |
| 17 | 617673439330669 |
| 18 | 5559060695695687 |
| 19 | 50031545486420197 |
| 20 | 450283907053258831 |
| 21 | 4052555156505760669 |
| 22 | 36472996387631139607 |
[7,37,271,2269,19927,177877,1596511,14355469, 129159847,1162320517,10460530351,94143710269, 847290203767,7625602267957,68630391713791, 617673439330669,5559060695695687, 50031545486420197,450283907053258831, 4052555156505760669,36472996387631139607] |