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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 38 |
| 4 | 422 |
| 5 | 6184 |
| 6 | 112632 |
| 7 | 2453296 |
| 8 | 62202800 |
| 9 | 1799623296 |
| 10 | 58507176320 |
| 11 | 2111633645824 |
| 12 | 83777729991936 |
| 13 | 3624054557443072 |
| 14 | 169759643117603840 |
| 15 | 8560585769442662400 |
| 16 | 462387289560368764928 |
| 17 | 26633435981686107701248 |
| 18 | 1629609677806398679646208 |
| 19 | 105555926477075661655441408 |
| 20 | 7215930505311133152120995840 |
[0,1,5,38,422,6184,112632,2453296,62202800, 1799623296,58507176320,2111633645824, 83777729991936,3624054557443072, 169759643117603840,8560585769442662400, 462387289560368764928,26633435981686107701248, 1629609677806398679646208, 105555926477075661655441408, 7215930505311133152120995840] |