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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 58 |
| 4 | 3236 |
| 5 | 713727 |
| 6 | 627642640 |
| 7 | 2205897096672 |
| 8 | 31004442653082720 |
| 9 | 1743005531132374350208 |
| 10 | 391947224244531572312436328 |
| 11 | 352545281714327012273215572739472 |
| 12 | 1268416358395092955994185170741834144224 |
| 13 | 18254446075150458724007419019753847268167282688 |
[1,1,4,58,3236,713727,627642640,2205897096672, 31004442653082720,1743005531132374350208, 391947224244531572312436328, 352545281714327012273215572739472, 1268416358395092955994185170741834144224, 18254446075150458724007419019753847268167282688] |