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| n | a(n) |
|---|---|
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 31 |
| 6 | 0 |
| 7 | 257 |
| 8 | 73 |
| 9 | 683 |
| 10 | 113 |
| 11 | 331 |
| 12 | 109 |
| 13 | 61681 |
| 14 | 5419 |
| 15 | 2796203 |
| 16 | 1613 |
| 17 | 3033169 |
| 18 | 1321 |
| 19 | 599479 |
| 20 | 122921 |
| 21 | 38737 |
| 22 | 22366891 |
| 23 | 8831418697 |
| 24 | 2931542417 |
| 25 | 22253377 |
| 26 | 268501 |
| 27 | 131071 |
| 28 | 28059810762433 |
| 29 | 279073 |
| 30 | 54410972897 |
| 31 | 77158673929 |
| 32 | 145295143558111 |
[0,0,0,31,0,257,73,683,113,331,109,61681,5419, 2796203,1613,3033169,1321,599479,122921,38737, 22366891,8831418697,2931542417,22253377,268501, 131071,28059810762433,279073,54410972897, 77158673929,145295143558111] |