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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 62 |
| 3 | 1614 |
| 4 | 58904 |
| 5 | 2764880 |
| 6 | 158631120 |
| 7 | 10755909010 |
| 8 | 841471425920 |
| 9 | 74605812325020 |
| 10 | 7392555309228800 |
| 11 | 809594650092540950 |
| 12 | 97103822900059929600 |
| 13 | 12659189667284189060200 |
| 14 | 1782335176686080469555200 |
| 15 | 269524635118213823349788250 |
| 16 | 43567606796796836119605248000 |
[1,4,62,1614,58904,2764880,158631120,10755909010, 841471425920,74605812325020,7392555309228800, 809594650092540950,97103822900059929600, 12659189667284189060200,1782335176686080469555200, 269524635118213823349788250, 43567606796796836119605248000] |