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A274722 as a simple table

na(n)
11
26
368
41632
584948
68960464
71980677448
8905233056800
9860544738080372
101705630286322728068

[1,6,68,1632,84948,8960464,1980677448,
 905233056800,860544738080372,1705630286322728068]