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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 50 |
| 5 | 418 |
| 6 | 4348 |
| 7 | 54016 |
| 8 | 779804 |
| 9 | 12824540 |
| 10 | 236648024 |
| 11 | 4841363104 |
| 12 | 108748223128 |
| 13 | 2660609220952 |
| 14 | 70422722065040 |
| 15 | 2005010410792832 |
| 16 | 61098981903602192 |
| 17 | 1984186236246187024 |
| 18 | 68407835576255308576 |
| 19 | 2495374564069015050880 |
| 20 | 96019859122742736121376 |
| 21 | 3886906732751071879958816 |
| 22 | 165120572466718493379680192 |
[1,1,2,8,50,418,4348,54016,779804,12824540, 236648024,4841363104,108748223128,2660609220952, 70422722065040,2005010410792832,61098981903602192, 1984186236246187024,68407835576255308576, 2495374564069015050880,96019859122742736121376, 3886906732751071879958816, 165120572466718493379680192] |