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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 19 |
| 4 | 189 |
| 5 | 2521 |
| 6 | 41813 |
| 7 | 826099 |
| 8 | 18889209 |
| 9 | 489450841 |
| 10 | 14142037665 |
| 11 | 449838952795 |
| 12 | 15587619260117 |
| 13 | 583210749984409 |
| 14 | 23380025164256829 |
| 15 | 997331252199242083 |
| 16 | 44981225190596283921 |
| 17 | 2131771651553974931929 |
| 18 | 105498794931132306727769 |
| 19 | 5415121471957856287745611 |
| 20 | 286003536194104676920620909 |
| 21 | 15383978962252356122447259865 |
[1,3,19,189,2521,41813,826099,18889209,489450841, 14142037665,449838952795,15587619260117, 583210749984409,23380025164256829, 997331252199242083,44981225190596283921, 2131771651553974931929,105498794931132306727769, 5415121471957856287745611, 286003536194104676920620909, 15383978962252356122447259865] |