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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 39 |
| 5 | 437 |
| 6 | 6051 |
| 7 | 99425 |
| 8 | 1893917 |
| 9 | 41077012 |
| 10 | 1000000001 |
| 11 | 27011044252 |
| 12 | 801840699303 |
| 13 | 25952747043667 |
| 14 | 909698753958571 |
| 15 | 34333545124721025 |
| 16 | 1388255822130839284 |
| 17 | 59875111056395524697 |
| 18 | 2743914679527468673294 |
| 19 | 133153224151130627642479 |
| 20 | 6821144143666773728762208 |
[1,1,5,39,437,6051,99425,1893917,41077012, 1000000001,27011044252,801840699303, 25952747043667,909698753958571,34333545124721025, 1388255822130839284,59875111056395524697, 2743914679527468673294,133153224151130627642479, 6821144143666773728762208] |