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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 41 |
| 5 | 346 |
| 6 | 3797 |
| 7 | 51157 |
| 8 | 816356 |
| 9 | 15050581 |
| 10 | 314726117 |
| 11 | 7359554632 |
| 12 | 190283748371 |
| 13 | 5389914888541 |
| 14 | 165983936096162 |
| 15 | 5521346346543307 |
| 16 | 197294173392918461 |
| 17 | 7536892461493548226 |
| 18 | 306520422583290179057 |
| 19 | 13222422454704116605057 |
| 20 | 603006160203712090160876 |
[1,2,7,41,346,3797,51157,816356,15050581, 314726117,7359554632,190283748371,5389914888541, 165983936096162,5521346346543307, 197294173392918461,7536892461493548226, 306520422583290179057,13222422454704116605057, 603006160203712090160876] |