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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 768 |
| 3 | 39366 |
| 4 | 655360 |
| 5 | 5859375 |
| 6 | 35271936 |
| 7 | 161414428 |
| 8 | 603979776 |
| 9 | 1937102445 |
| 10 | 5500000000 |
| 11 | 14147686146 |
| 12 | 33538572288 |
| 13 | 74231495611 |
| 14 | 154957850880 |
| 15 | 307546875000 |
| 16 | 584115552256 |
| 17 | 1067290888473 |
| 18 | 1884413258496 |
| 19 | 3226876977790 |
[0,1,768,39366,655360,5859375,35271936,161414428, 603979776,1937102445,5500000000,14147686146, 33538572288,74231495611,154957850880,307546875000, 584115552256,1067290888473,1884413258496, 3226876977790] |