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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 52 |
| 2 | 6300 |
| 3 | 867724 |
| 4 | 126266140 |
| 5 | 18946089552 |
| 6 | 2899163518020 |
| 7 | 449724340595400 |
| 8 | 70465174099304220 |
| 9 | 11126033860866694000 |
| 10 | 1767446723088509218800 |
| 11 | 282158365425331981232556 |
| 12 | 45228300709147862285651140 |
| 13 | 7274727731093117939040291440 |
| 14 | 1173526754722358526308356738200 |
| 15 | 189786287381449802019915589798224 |
[1,52,6300,867724,126266140,18946089552, 2899163518020,449724340595400,70465174099304220, 11126033860866694000,1767446723088509218800, 282158365425331981232556, 45228300709147862285651140, 7274727731093117939040291440, 1173526754722358526308356738200, 189786287381449802019915589798224] |