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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 57 |
| 4 | 2921 |
| 5 | 540145 |
| 6 | 364558049 |
| 7 | 906918346689 |
| 8 | 8394259686375297 |
| 9 | 291375477821572448001 |
| 10 | 38187935488350036891532801 |
| 11 | 19005446750755761952317881973761 |
| 12 | 36091267618694510017592440805677594625 |
| 13 | 262587035725176662374187801686523815760228353 |
| 14 | 7345273837043092730077580223639933697831592435638273 |
[1,1,4,57,2921,540145,364558049,906918346689, 8394259686375297,291375477821572448001, 38187935488350036891532801, 19005446750755761952317881973761, 36091267618694510017592440805677594625, 262587035725176662374187801686523815760228353, 73452738370430927300775802236399336978315924356382\ 73] |