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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 17 |
| 3 | 244 |
| 4 | 3455 |
| 5 | 50356 |
| 6 | 766943 |
| 7 | 12274858 |
| 8 | 206788751 |
| 9 | 3666278080 |
| 10 | 68339173319 |
| 11 | 1337340802942 |
| 12 | 27431518405607 |
| 13 | 588814390368244 |
| 14 | 13204430589422015 |
| 15 | 308877966133175746 |
| 16 | 7525275697320564383 |
| 17 | 190678032594396773128 |
| 18 | 5017985343328106906711 |
| 19 | 136977444553573371090790 |
[0,1,17,244,3455,50356,766943,12274858,206788751, 3666278080,68339173319,1337340802942, 27431518405607,588814390368244,13204430589422015, 308877966133175746,7525275697320564383, 190678032594396773128,5017985343328106906711, 136977444553573371090790] |