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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 36 |
| 4 | 331776 |
| 5 | 42998169600000000 |
| 6 | 7244150201408990671659859968000000000000000 |
| 7 | 1182813011613388022005884215741990164001544397058025540221953280041975323323006976000000000000000000000000000000 |
[1,1,2,36,331776,42998169600000000, 7244150201408990671659859968000000000000000, 11828130116133880220058842157419901640015443970580\ 25540221953280041975323323006976000000000000000000\ 000000000000] |