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A252741 as a simple table

na(n)
01
12
26
3360
4102060000
570740876785040000000000
64202178315558341781781575963435449520000000000000000000000000

[1,2,6,360,102060000,70740876785040000000000,
 42021783155583417817815759634354495200000000000000\
 00000000000]