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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 32 |
| 4 | 1074 |
| 5 | 12600 |
| 6 | 1525292 |
| 7 | 34078720 |
| 8 | 4072850100 |
| 9 | 263459065600 |
| 10 | 106809546673488 |
| 11 | 2254519427530752 |
| 12 | 3172225081523720416 |
| 13 | 210351382651302645760 |
| 14 | 45654014718074873700000 |
| 15 | 11122845097194072534155264 |
| 16 | 18156837198112938091803999360 |
| 17 | 795289872611524024920215715840 |
[1,1,5,32,1074,12600,1525292,34078720,4072850100, 263459065600,106809546673488,2254519427530752, 3172225081523720416,210351382651302645760, 45654014718074873700000, 11122845097194072534155264, 18156837198112938091803999360, 795289872611524024920215715840] |