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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 7 |
| 3 | 90 |
| 4 | 1129 |
| 5 | 14976 |
| 6 | 255199 |
| 7 | 4849770 |
| 8 | 111546337 |
| 9 | 3234846488 |
| 10 | 100280244907 |
| 11 | 3710369067210 |
| 12 | 152125131763369 |
| 13 | 6541380665834736 |
| 14 | 307444891294245379 |
| 15 | 16294579238595021986 |
| 16 | 961380175077106319097 |
| 17 | 58644190679703485491136 |
| 18 | 3929160775540133527938979 |
[1,0,7,90,1129,14976,255199,4849770,111546337, 3234846488,100280244907,3710369067210, 152125131763369,6541380665834736, 307444891294245379,16294579238595021986, 961380175077106319097,58644190679703485491136, 3929160775540133527938979] |