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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 42 |
| 4 | 10455 |
| 5 | 17957112 |
| 6 | 139031457162 |
| 7 | 4542089826393987 |
| 8 | 623345036311461259086 |
| 9 | 359303834921251677870936120 |
| 10 | 869870085407321787861592624745847 |
[1,2,42,10455,17957112,139031457162, 4542089826393987,623345036311461259086, 359303834921251677870936120, 869870085407321787861592624745847] |