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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 7 |
| 3 | 20 |
| 4 | 87 |
| 5 | 629 |
| 6 | 716 |
| 7 | 3493 |
| 8 | 4209 |
| 9 | 32956 |
| 10 | 136033 |
| 11 | 305022 |
| 12 | 441055 |
| 13 | 2951352 |
| 14 | 118495135 |
| 15 | 713922162 |
| 16 | 832417297 |
| 17 | 2378756756 |
| 18 | 10347444321 |
| 19 | 74810867003 |
| 20 | 85158311324 |
| 21 | 415444112299 |
| 22 | 500602423623 |
| 23 | 3919661077660 |
| 24 | 16179246734263 |
| 25 | 36278154546186 |
[1,6,7,20,87,629,716,3493,4209,32956,136033, 305022,441055,2951352,118495135,713922162, 832417297,2378756756,10347444321,74810867003, 85158311324,415444112299,500602423623, 3919661077660,16179246734263,36278154546186] |