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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 8 |
| 3 | 117 |
| 4 | 2584 |
| 5 | 77245 |
| 6 | 2923776 |
| 7 | 134147881 |
| 8 | 7237959296 |
| 9 | 449153207001 |
| 10 | 31518672486400 |
| 11 | 2468063119978621 |
| 12 | 213353171897306112 |
| 13 | 20181854221412587093 |
| 14 | 2073632053555295657984 |
| 15 | 229977288184566078752625 |
| 16 | 27382787929802599713243136 |
| 17 | 3483970698377702965413968689 |
[0,1,8,117,2584,77245,2923776,134147881, 7237959296,449153207001,31518672486400, 2468063119978621,213353171897306112, 20181854221412587093,2073632053555295657984, 229977288184566078752625, 27382787929802599713243136, 3483970698377702965413968689] |