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| n | a(n) |
|---|---|
| 0 | 15 |
| 1 | 33 |
| 2 | 231 |
| 3 | 561 |
| 4 | 3735 |
| 5 | 8673 |
| 6 | 58407 |
| 7 | 146673 |
| 8 | 951831 |
| 9 | 2200161 |
| 10 | 15007527 |
| 11 | 37618161 |
| 12 | 243401751 |
| 13 | 562961505 |
| 14 | 3835839783 |
| 15 | 9654230001 |
| 16 | 62277025815 |
| 17 | 1438881404513 |
| 18 | 981400027431 |
| 19 | 2471753680881 |
| 20 | 15945066090519 |
| 21 | 38848671944801 |
| 22 | 251274914238759 |
| 23 | 633024492828657 |
| 24 | 4081389310836759 |
| 25 | 589338770407521 |
| 26 | 6431706870343299 |
| 27 | 161989104772314217 |
| 28 | 1044976403211096087 |
[15,33,231,561,3735,8673,58407,146673,951831, 2200161,15007527,37618161,243401751,562961505, 3835839783,9654230001,62277025815,1438881404513, 981400027431,2471753680881,15945066090519, 38848671944801,251274914238759,633024492828657, 4081389310836759,589338770407521,6431706870343299, 161989104772314217,1044976403211096087] |