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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 1 |
| 2 | 129 |
| 3 | 193 |
| 4 | 8449 |
| 5 | 20801 |
| 6 | 561537 |
| 7 | 1892801 |
| 8 | 37831169 |
| 9 | 158970433 |
| 10 | 2580165249 |
| 11 | 12754272961 |
| 12 | 177884848897 |
| 13 | 994158318401 |
| 14 | 12378788647809 |
| 15 | 76004921025473 |
| 16 | 868247394485249 |
| 17 | 5732562340115521 |
| 18 | 61300395587171457 |
| 19 | 428184385354564801 |
| 20 | 4351409702933538049 |
[2,1,129,193,8449,20801,561537,1892801,37831169, 158970433,2580165249,12754272961,177884848897, 994158318401,12378788647809,76004921025473, 868247394485249,5732562340115521, 61300395587171457,428184385354564801, 4351409702933538049] |