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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 5 |
| 3 | 84 |
| 4 | 4133 |
| 5 | 317966 |
| 6 | 55491832 |
| 7 | 19876401224 |
| 8 | 15564645769042 |
| 9 | 26617222097087230 |
| 10 | 99905925686618815012 |
| 11 | 832547140418699137884096 |
| 12 | 15355865014207234684746438192 |
| 13 | 632296902429868672596327438625296 |
[0,5,84,4133,317966,55491832,19876401224, 15564645769042,26617222097087230, 99905925686618815012,832547140418699137884096, 15355865014207234684746438192, 632296902429868672596327438625296] |