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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 49 |
| 4 | 679 |
| 5 | 12151 |
| 6 | 266321 |
| 7 | 6906257 |
| 8 | 206788751 |
| 9 | 7020426511 |
| 10 | 266464077769 |
| 11 | 11180868467209 |
| 12 | 513915970996583 |
| 13 | 25678820830238759 |
| 14 | 1385874945753239969 |
| 15 | 80341660921985676961 |
| 16 | 4979071555472111291551 |
| 17 | 328496221117149603559327 |
| 18 | 22987138271050177264124441 |
[0,1,5,49,679,12151,266321,6906257,206788751, 7020426511,266464077769,11180868467209, 513915970996583,25678820830238759, 1385874945753239969,80341660921985676961, 4979071555472111291551,328496221117149603559327, 22987138271050177264124441] |