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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 19 |
| 4 | 121 |
| 5 | 1041 |
| 6 | 11191 |
| 7 | 130663 |
| 8 | 1731969 |
| 9 | 25778161 |
| 10 | 432791371 |
| 11 | 7752723771 |
| 12 | 151553121193 |
| 13 | 3178030999729 |
| 14 | 71244609480591 |
| 15 | 1716351868658911 |
| 16 | 43661944977384961 |
| 17 | 1173984102030774753 |
| 18 | 33302371396771085779 |
| 19 | 991402105480284394531 |
| 20 | 30912472614894951462681 |
[1,1,3,19,121,1041,11191,130663,1731969,25778161, 432791371,7752723771,151553121193,3178030999729, 71244609480591,1716351868658911,43661944977384961, 1173984102030774753,33302371396771085779, 991402105480284394531,30912472614894951462681] |