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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 61 |
| 4 | 495 |
| 5 | 7929 |
| 6 | 126875 |
| 7 | 2030013 |
| 8 | 32480223 |
| 9 | 1039367153 |
| 10 | 33259748915 |
| 11 | 1064311965301 |
| 12 | 34057982889655 |
| 13 | 1089855452468985 |
| 14 | 34875374479007547 |
| 15 | 1116011983328241533 |
| 16 | 35712383466503729087 |
| 17 | 2285592541856238661601 |
[1,7,61,495,7929,126875,2030013,32480223, 1039367153,33259748915,1064311965301, 34057982889655,1089855452468985,34875374479007547, 1116011983328241533,35712383466503729087, 2285592541856238661601] |