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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 34 |
| 4 | 956 |
| 5 | 106721 |
| 6 | 75818480 |
| 7 | 490656737694 |
| 8 | 22960404169011552 |
| 9 | 7141530219670856270919 |
| 10 | 20319415706020976355219258316 |
| 11 | 1104797870481014132439711155738991604 |
[1,4,34,956,106721,75818480,490656737694, 22960404169011552,7141530219670856270919, 20319415706020976355219258316, 1104797870481014132439711155738991604] |