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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 28 |
| 3 | 1192 |
| 4 | 591460 |
| 5 | 3441637504 |
| 6 | 219272057247376 |
| 7 | 185528149944660881488 |
| 8 | 2405748000504972140803769860 |
| 9 | 349789137657321307953339196885516144 |
| 10 | 652520795984468974632890750361094911319873648 |
[1,4,28,1192,591460,3441637504,219272057247376, 185528149944660881488, 2405748000504972140803769860, 349789137657321307953339196885516144, 652520795984468974632890750361094911319873648] |