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A185771 as a simple table

na(n)
181
2558
33844
426784
5186624
61296000
79000000
862568000
9434972736
103022785216
1121006444096
12146001569472
131014758051904
147052535822528
1549014897132096
16340658500222656
172367611084874816
1816455017381102784
19114363207176279616

[81,558,3844,26784,186624,1296000,9000000,
 62568000,434972736,3022785216,21006444096,
 146001569472,1014758051904,7052535822528,
 49014897132096,340658500222656,2367611084874816,
 16455017381102784,114363207176279616]