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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 15 |
| 3 | 32 |
| 4 | 527 |
| 5 | 1104 |
| 6 | 17919 |
| 7 | 37520 |
| 8 | 608735 |
| 9 | 1274592 |
| 10 | 20679087 |
| 11 | 43298624 |
| 12 | 702480239 |
| 13 | 1470878640 |
| 14 | 23863649055 |
| 15 | 49966575152 |
| 16 | 810661587647 |
| 17 | 1697392676544 |
| 18 | 27538630330959 |
| 19 | 57661384427360 |
| 20 | 935502769664975 |
| 21 | 1958789677853712 |
| 22 | 31779555538278207 |
| 23 | 66541187662598864 |
| 24 | 1079569385531794079 |
| 25 | 2260441590850507680 |
[0,15,32,527,1104,17919,37520,608735,1274592, 20679087,43298624,702480239,1470878640, 23863649055,49966575152,810661587647, 1697392676544,27538630330959,57661384427360, 935502769664975,1958789677853712, 31779555538278207,66541187662598864, 1079569385531794079,2260441590850507680] |