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| n | a(n) |
|---|---|
| 2 | 5 |
| 3 | 28 |
| 4 | 167 |
| 5 | 1024 |
| 6 | 6359 |
| 7 | 39759 |
| 8 | 249699 |
| 9 | 1573524 |
| 10 | 9943905 |
| 11 | 62994733 |
| 12 | 399936573 |
| 13 | 2543992514 |
| 14 | 16210331727 |
| 15 | 103453402718 |
| 16 | 661164765879 |
| 17 | 4230874777682 |
| 18 | 27105456280491 |
| 19 | 173838468040879 |
| 20 | 1115987495619427 |
| 21 | 7170725839251598 |
| 22 | 46113396476943241 |
| 23 | 296773029762031990 |
[5,28,167,1024,6359,39759,249699,1573524,9943905, 62994733,399936573,2543992514,16210331727, 103453402718,661164765879,4230874777682, 27105456280491,173838468040879,1115987495619427, 7170725839251598,46113396476943241, 296773029762031990] |