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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 65 |
| 4 | 747 |
| 5 | 10161 |
| 6 | 158823 |
| 7 | 2794401 |
| 8 | 54510795 |
| 9 | 1165346721 |
| 10 | 27053090343 |
| 11 | 676902963969 |
| 12 | 18142447198923 |
| 13 | 518153657647185 |
| 14 | 15699151506800583 |
| 15 | 502656646673908449 |
| 16 | 16950329213158040427 |
| 17 | 600210130556531336769 |
| 18 | 22258602933289539520455 |
| 19 | 862449563473679156954049 |
| 20 | 34840561666808397518614827 |
[1,1,7,65,747,10161,158823,2794401,54510795, 1165346721,27053090343,676902963969, 18142447198923,518153657647185,15699151506800583, 502656646673908449,16950329213158040427, 600210130556531336769,22258602933289539520455, 862449563473679156954049, 34840561666808397518614827] |