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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 155 |
| 2 | 2429160 |
| 3 | 23841478316240 |
| 4 | 727595757696091789500850 |
| 5 | 346944695195247913885977115917541969344 |
| 6 | 12924697071141057365742388361357854155242942276714117373280 |
[1,155,2429160,23841478316240, 727595757696091789500850, 346944695195247913885977115917541969344, 12924697071141057365742388361357854155242942276714\ 117373280] |